I had the same thought because DoorDash was once pummeled with arbitration fees by angry drivers, and it looks like Robinhood doesn't specify who pays the fee. I'm assuming that leaves the burden on the consumer, but maybe their arbitrator (FINRA) has some rule I'm missing.

There are actually law firms that specialize in arbitration at scale.

Customers: "We want to sue you."

Company: "Sorry you can't do a class-action, we have a binding arbitration clause."

Law firm representing customers: "Ok, here is the paperwork for 1500 arbitrations, have fun with that. We can do this all day."