IANAL, but isn't champerty permitted (or not prohibited) in almost every state? I don't think there's any remotely recent precedent for state-level champerty statutes (the few that still exist) being enforced in a commercial litigation context, and I think this situation is one in which the plaintiffs (Equifax data breach victims) are already planning to file suit, thus not rising to the level of "champerty and maintenance" being applied to frivolous litigation that such statutes aim to prevent.