Money launderers are usually caught because they're already under investigation. Others become apparent when lifestyle and reported income disagree.

When thinking about what the government might do in a specific situation involving cryptocurrency, I've found it helps to replace "Bitcoin" with "cash". "I tumbled Bitcoin" becomes "I laundered cash." "I got paid Bitcoin for my car" becomes "I have unexplainable cash because a stranger gave it to me for my car." "I used TOR while being paid Bitcoin" becomes "someone I don't know drops off cash for me in person." "How can they bust everyone using cryptocurrency" becomes "how does the government keep people and businesses more or less honest when it comes to reporting cash business." "Depositing lots of Bitcoin" becomes "depositing lots of unexplained cash." Et cetera

Less than 2% of "money laundering" is ever caught. That's despite the enormous time, money, and loss of dignity and privacy burdens, which are overwhelmingly borne by people with no connection to crime whatsoever. "Anti money laundering" is a parasite on humanity. They should let it drop to 0% and not bother with any of it: they doubtless keep lying to themselves that they are doing something worthwhile; they are not.