For penny-ante criminal activity, yeah, BTC might make it easier for perpetrator and harder for the cops if he uses his head and a little common sense.
But for the bigger stuff and full blown fraud? (I.E. anything that's going to bring the full weight down on your head.) I don't think BTC will change things much unless you're willing to never, ever touch the hidden or ill gotten money that you've somehow managed to never have in your name in traceable records in the first place. Once it's traceable, I suspect it doesn't matter much if it disappears as traceable USD and re-appears as a Tesla bought with (theoretically untraceable) BTC... You're going to have some explaining to do, and it's going to be very hard to create reasonable doubt.
But as always, the "if you can't do the time" rules applies unless you're 110% certain you'll never slip up. Because all it takes sometimes is once.