I hope all the potential plaintiffs get together and initiate what could effectively be a "grassroots" class action, by coordinating their strategy, information, jurisprudence research, etc.

Were there confidentiality terms in the arbitration clauses of the original contracts?

Also if enough people flood them with arbitration you can outscale the company, to the point where they're begging the courts to more efficiently tackle the matter, eg: https://archive.li/kZu1h