If you've followed Rios v. HRB Digital through the Northern District of California, this isn't really news. You've already seen it coming.
For everyone else, the shift happened over the last 18 months and almost nobody priced it in.
Five years ago, the defense playbook for mass arbitration was straightforward. Argue the clause was unconscionable. Fight class certification. Drag fee disputes through court. The 2024 AAA and JAMS rule updates closed most of those off. The plaintiff bar got better at filing in waves. Process Arbitrators let administrators screen out duplicates without the fee shock. The leverage shifted.
So the defense moved.
Not into the courtroom.
Into the terms of service.
What's actually in the new clauses
The model defense clause in 2026 doesn't say "no arbitration" or "class waiver." Both of those have been litigated to a standstill. The new clauses do three things, often together.
First, they swap providers. Out goes "AAA or JAMS or another nationally recognized administrator." In comes a specific designation: NAM, ADR Services, or a bespoke ad hoc panel chosen by the company. Both AAA and JAMS published mass arbitration rules with claimant-friendly batching, fee caps, and process arbitrator screens. If the clause doesn't name them, those rules don't apply by default.
Second, they install a tranche protocol. The Rios v. HRB Digital docket lays this out plainly. Under H&R Block's protocol, claimants cannot file all their individual arbitrations at once. Only a limited tranche moves forward. The next tranche waits until the prior one completes. The plaintiffs argued this "prevents claimants from filing their claims at all until prior tranches have been completed, ceding control of the case timeline entirely to HRB." The clause is still being litigated. The drafting model is already spreading.
Third, they front-load procedure. Mandatory pre-arbitration internal dispute resolution, sometimes 60 days. Mandatory mediation as a condition precedent. AI triage funnels. Identity verification steps that didn't exist when the original ToS was signed.
None of these blocks arbitration. Each adds weeks. Stack three of them and a campaign that should have wrapped in 14 months runs 30.
This is a case P&L problem, not a legal one
I keep hearing this framed as a question of enforceability. Will the clause hold up? Will Rios get certified? Will the 9th Circuit step in?
That's the wrong frame.
Even if a tranche protocol is eventually struck down, you spent two years and meaningful capital litigating it. The defense paid filing fees for 50 cases at a time instead of 5,000. Your contingent-fee model burned in real time while the question got answered.
The right frame is unit economics.
If a tranche protocol forces 50 cases through every 90 days, on a 5,000-claimant matter that's 100 tranches. At 90 days per tranche, you're 25 years out from finishing. Even at 10 days per tranche (impossible in practice, but assume it), you're three years out. The defense's fee exposure spreads over those years. Yours doesn't. You financed intake, marketing, and case development for the whole 5,000 up front.
The discount rate matters. The math doesn't pencil at any reasonable cost of capital.
Know the providers cold
This is where it pays to know what each administrator's rules actually say.
AAA's Mass Arbitration Supplementary Rules trigger at 25 or more similar consumer or employment claims (100 for B2B). The administrator can appoint a Process Arbitrator to handle threshold issues, including consent, identity, and duplicates. The fee schedule caps initiation at $3,125 (claimants) and $8,125 (business), per matter, regardless of how many cases. Per-case fees scale from $125 down to $75.
JAMS triggers mass arbitration treatment at 75 or more similar Demands. Single $5,000 filing fee for the business, $2,500 for claimants total, not per case. Arbitrator appointment fees of $2,000 or $3,500 depending on panel size. A 13% Case Management Fee against projected professional fees.
NAM publishes mass arbitration rules. They are less battle-tested. Less plaintiff-side litigation has stress-tested their fee math and procedural defaults.
ADR Services administers under panel rules but with broad latitude for parties to customize, which in practice means the drafting defendant customizes.
When the defendant's clause sends you to ADR Services under a custom protocol, the AAA and JAMS schedules above are irrelevant to your math. You build the model against the clause itself.
What to check before you sign the engagement letter
Read the defendant's terms of service in full, including any incorporated arbitration rider. Not the summary. The full text.
Specifically check for:
A named provider that is not AAA or JAMS. If the clause doesn't say "AAA" or "JAMS" by name, those administrators' mass arb rules don't apply by default.
A "mass arbitration protocol" section, sometimes labeled "batch arbitration" or "coordinated proceedings." If it limits how many cases proceed at once, you have a tranche problem.
A pre-arbitration period of more than 30 days, particularly if it requires mediation as a condition precedent.
A unilateral right for the company to modify the dispute resolution procedure. The Ubisoft 2025 ToS is the cleanest model here, reserving discretion to choose "procedures that increase the efficiency of administration and resolution." Read that as discretion to bolt on slowdowns mid-campaign.
If any of those are present, run your case P&L with the slow-track math, not the AAA/JAMS default. The difference is six figures on most matters.
The defense isn't trying to win in court anymore.
They're trying to make the calendar do the work.
The firms still pricing their cases on the assumption that mass arb runs the way it did in 2022 are the ones funding the experiment.
If you want a clause-level read on a defendant's terms before you commit to a mass arb engagement, that's the kind of pre-filing review we run for plaintiff firms. Reach Kasia at (800) 800-4045 or visit massarb.groupsettle.com.