Going after them all on your own would be very difficult and expensive, they have the money on lawsuits, but you as a single individual would prolly run out of yours whilst the case is on.

If it were a class action lawsuit, then it would prolly make more sense or if many of the victims can come together and create an online petition to the relevant authorities and request that as many as are victims or believe the service is a scam, should sign the petition, just as this user did for the Freewallet scam:
https://bitcointalk.org/index.php?topic=5462119.msg62648631#msg62648631