There are strict rules about not talking about open investigations because of so-called "Tipping-off" rules. It can carry some pretty serious penalties - jail time, fines. I agree it would be nice if the FBI itself made some announcements about these sorts of things, and they might do that in aggregate, but if you're a bank or fintech employee and you're in communication with the FBI you absolutely cannot say anything about it. Even confirming that an investigation existed could be penalized.