10 Mass Arbitration Cases That Changed American Law

Abernathy v. DoorDash is the foundational mass arbitration case — the one that established, in the most quotable judicial language in the field's history, that companies cannot demand arbitration from workers and then refuse to pay for it when workers actually show up.

In 2019, Keller Lenkner filed individual arbitration demands on behalf of 6,250 DoorDash delivery couriers claiming misclassification as independent contractors. The couriers paid over $1.2 million in filing fees. DoorDash, faced with a bill of nearly $12 million in its own AAA fees, refused to pay — and the AAA closed the cases. Judge William Alsup ordered DoorDash to immediately arbitrate with 5,010 couriers and pay $9.5 million in fees.

What it established: Companies cannot selectively enforce arbitration clauses — using them to block class actions when convenient, then refusing to honor them when workers invoke them at scale. Courts will compel arbitration and require fee payment even when volume is financially painful.

Strategic implication: The DoorDash case proved that employment mass arbitration was viable and that courts would enforce the fee obligation. It opened the door for mass employment campaigns across gig economy, warehouse, and retail sectors.

No single event better defines mass arbitration's potential than Amazon's decision in May 2021 to remove its mandatory arbitration clause entirely. Keller Postman filed approximately 75,000 individual demands on behalf of Amazon Alexa users alleging conversations had been recorded without consent. Amazon calculated that arbitrating each individual claim would be more expensive than eliminating the clause — and retreated.

Amazon's retreat restored court access for over 140 million Amazon consumers. Following the clause removal, Keller Postman filed a federal antitrust lawsuit in the Northern District of California — one of the first such suits permitted since consumers had been locked out of court by the arbitration requirement.

What it established: Mass arbitration can force companies to abandon arbitration clauses altogether — making court access available to tens of millions of previously blocked consumers. The threat alone, before a single arbitration hearing, changed Amazon's fundamental legal posture.

Strategic implication: Sometimes the goal of a mass arbitration campaign isn't to win every arbitration. Sometimes the goal is to make the clause too expensive to maintain — opening entirely new litigation fronts in federal court.

The TurboTax campaign demonstrated that mass arbitration could work in consumer fraud contexts at truly massive scale. Keller Postman filed approximately 200,000 individual demands against Intuit, alleging the company deceptively steered consumers toward paid tax preparation when they qualified for free filing. The campaign ran parallel to an FTC enforcement action over the same conduct.

The campaign ultimately resolved confidentially. The FTC separately secured a $141 million settlement fund for affected consumers in 2022.

What it established: Mass arbitration can run simultaneously with regulatory enforcement — amplifying settlement pressure from both directions. It also surfaced ethical concerns around claimant vetting that led AAA and JAMS to require counsel attestation in their 2024 rule changes.

Strategic implication: Consumer fraud theories — particularly around deceptive marketing and fee disclosures — are viable mass arbitration vehicles when the defendant's conduct is systematic and the claimant pool is easily identifiable through digital marketing.

Technically a class action rather than a mass arbitration, the Facebook BIPA case is essential context because it established the legal theory now powering dozens of mass arbitration campaigns. Edelson PC filed the first major class action against Facebook under Illinois's Biometric Information Privacy Act, alleging Facebook collected facial recognition data from user photos without authorization. The case settled in 2021 for $650 million — the largest single-state privacy settlement in U.S. history at the time.

The Facebook settlement created the template that mass arbitration firms — Milberg, Keller Postman, Consovoy McCarthy — subsequently deployed at scale. When a company has an arbitration clause, the BIPA class action becomes a mass arbitration. The legal theory is identical; only the procedural vehicle changes.

What it established: BIPA claims carry real monetary value. This gave plaintiffs' firms the economics needed to justify large-scale mass arbitration campaigns targeting companies with biometric data practices.

Strategic implication: Any company operating in Illinois — or whose users include Illinois residents — that collects facial geometry, voiceprints, or fingerprints without compliant consent procedures is a BIPA mass arbitration target.

Boone v. Snap is one of the clearest documented examples of mass arbitration producing a large-scale settlement through the AAA process. Milberg filed more than 10,000 individual demands on behalf of Snapchat users alleging privacy violations. The resulting fee pressure drove Snap to settle for $35 million — covering approximately 3 million consumers.

What it established: Mass arbitration produces real monetary outcomes at scale. Even when individual claim values are modest, coordinated filing generates aggregate settlements worth tens of millions.

Strategic implication: Consumer privacy claims with small per-claimant value but large addressable populations are ideal mass arbitration vehicles — exactly the scenario the strategy was designed for.

Wallrich v. Samsung is the most significant defendant victory in mass arbitration to date. A plaintiffs' firm filed 35,651 individual BIPA demands against Samsung alleging devices had unlawfully collected biometric data. The AAA assessed Samsung $4,125,000 in filing fees. Samsung refused to pay, pointing to missing contact information, duplicate claims, and demands filed for people who appeared to have never owned Samsung devices. The AAA closed the cases.

The Seventh Circuit reversed the district court 3-0, holding that the consumers had failed to meet their evidentiary burden to prove the existence of an arbitration agreement with Samsung. A spreadsheet of names plus a copy of the defendant's terms of service is not sufficient evidence.

What it established: Claimants cannot simply allege they have an arbitration agreement — they must prove it with admissible evidence. Counsel must produce, for each claimant, documentation showing they purchased the product, used the service, and agreed to the terms containing the arbitration clause.

Strategic implication for plaintiffs' firms: Intake documentation is now legally critical. Before filing demands, firms must be able to produce purchase receipts, account creation records, or signed declarations establishing each claimant's relationship with the defendant.

Live Nation updated its terms to replace JAMS with New Era ADR — a newer provider charging companies on a flat subscription basis rather than per case, eliminating the fee-per-filing leverage that makes mass arbitration economically powerful. The district court and subsequently the Ninth Circuit held that Live Nation's New Era clause was unconscionable — the bellwether provision would require test cases before all claims could proceed, potentially delaying claimants for years, and the overall design benefited the corporate defendant rather than providing neutral dispute resolution.

What it established: Companies cannot simply switch to an alternative arbitration provider specifically designed to neutralize mass arbitration leverage. Courts will look behind the clause to evaluate whether the chosen forum provides meaningful access to dispute resolution.

Strategic implication: New Era ADR's subscription model remains largely unenforceable under current case law. When defendants have recently switched arbitration providers, it may signal vulnerability to a mass arbitration campaign.

In April 2024, Consovoy McCarthy filed 19,541 concurrent demands against Sega under California's Unruh Civil Rights Act. JAMS issued a single invoice for $39 million in initiation fees. Sega refused to pay and filed two separate lawsuits: one against JAMS in Los Angeles Superior Court, and one against Consovoy McCarthy in the Eastern District of Virginia alleging tortious interference and false advertising. The Virginia case against Consovoy McCarthy survived a motion to dismiss in 2024 — meaning defendants may have a viable path to hold plaintiffs' firms directly liable for allegedly abusive mass filings.

What it established (so far): Defendants can sue both the plaintiffs' firm and the arbitration forum. Courts will allow such suits to proceed past the motion to dismiss stage.

Strategic implication: Claimant vetting is now a legal liability issue. Firms filing mass arbitration demands must demonstrate that each claimant has a genuine, individualized claim. Filing demands for people who haven't authorized representation creates direct exposure to the kind of counterclaims Sega pursued.

Filed one month after Sega, Tubi's suit against Keller Postman follows the same template — a corporate defendant accusing a leading mass arbitration firm of filing meritless demands to manufacture settlement leverage through fees. Tubi alleged that Keller Postman filed nearly 24,000 demands without properly vetting claimants, with consumers able to sign up "in as little as two minutes." The D.C. District Court dismissed for lack of personal jurisdiction — a procedural dismissal, not a finding on the merits.

What it established: Corporate defendants are increasingly willing to file offensive litigation against plaintiffs' firms. The Tubi case, alongside Sega and L'Occitane v. Zimmerman Reed, represents a pattern of defendants treating mass arbitration campaigns as potential tort claims.

Strategic implication: Intake quality is the most legally sensitive part of a mass arbitration campaign. Firms that can demonstrate individualized review and documented client authorization are far better positioned against both forum-level challenges and direct litigation from defendants.

California's SB 707 penalized companies for paying arbitration fees late — potentially allowing claimants to immediately proceed in court and recover attorneys' fees. In August 2025, the California Supreme Court softened SB 707's application. The court held that while SB 707 is not preempted by the FAA, the 30-day payment deadline is not absolute. A company's failure to pay on time may be excused under general contract principles, so long as the company compensates claimants for actual harm and the failure was not willful, fraudulent, or grossly negligent.

What it established: SB 707 penalties are not automatic — they require proof of harm and are subject to contract defenses. Inadvertent delay is different from bad-faith refusal to pay.

Strategic implication: California mass arbitration campaigns remain highly viable, but the automatic SB 707 penalty is no longer guaranteed. Plaintiffs' attorneys must document specific harm from payment delays — not just invoke the statute's penalty provisions.