There is a growing trend of companies inserting "mass arbitration" or "coordinated filing" clauses into their contracts. It isn't clear if these will be enforceable.
The arbitration providers (AAA, JAMS, etc.) have also started implementing their own "mass arbitration" provisions. In some cases even providing subscription bulk pricing.
Other problems: https://arbitrationinformation.org/docs/problems/#mass-arbit...
(I should add the above + references at some point to the website)