You may want to familiarize yourself with the concept of rubber hose cryptography.
Granted, the United States Federal Government won't literally beat you with a hose, but they will take away your freedom until you comply with the lawful orders of the courts. The Government will go over your finances with a fine toothed comb, accounting for any and all assets you currently or previously owned, including bitcoin. If you obtained any of those assets via fraud you're going to be on the hook for repayment, plus criminal and civil penalties on top of the fraudulent earnings.
Want to play the "I lost them" card? You can try, but you're still going to be on the hook for the full amount Uncle Sam thinks you owe your victims, plus the aforementioned penalties, and you're not wiping any of that away with a bankruptcy. It will follow you until the day you die.
Bitcoin doesn't spend at the prison commissary, nor am I aware of any reputable criminal defense attorneys that accept payment in bitcoin.