Basically if you're running a ponzi scheme, an investor con, an unlicensed custodial bank, a non-conforming public securities offering, or a money-laundering operation, expect some agency of the Feds to come calling. But, uh.. duh? That has nothing to do with whether you are handling crypto currency or not.
So far we haven't seen action against legitimately innovative, non-scammy operations in this space. Just the offenders that are quite clearly and quite brazenly flipping their middle finger to the regulations.