I am not a Rabbi and not a Lawyer and burech hashem not a victim and not a family member of a victim AFAIK.
But I am wondering, based on how the Justice dept works, based on what it's reported in the news always, the Justice dept isn't interested in catching small fish, that's how it works by the labor dept atleast, when you hire ileagels they will not charge the ileagels they will use them against the employer, so I am sure here will work the same.
If all the victims organize as a class, hiring 1 good lawyer, I am sure they can go to the Justice dept and work out a deal and they will go against the big fish.
Now if they work as a group, I am sure they will have the leverage to go back to those companies and tell them look we have a heter from a Rov, (if they can get). The option is clear or you wonna work on a payback plan and do something real, let's say 60 cents on the dollar than its good, if not we will work with law enforcement and it will become a criminal case and they will end up paying much more and lose everything.
As far as it looks like now the perpetrators are hoping it should not be an organized opposition against them, hence trying to make the victims look as stupid investors, therefore people should hide as a shame.