Isn't it better to seek similarly minded people, that are willing to file group case, instead of accusing an entire market of giant fraud?
It is just this one exchange that got you in to suspicions, not crypto market as a whole, right? Gather the evidence, the more the better and look for potential witnesses, next is a good layer and voila. Just try to present yourself as being genuinely concern for customer safety, don't rant and call names If you're right, god will provide, as they say.