I know some pretty sharp folks who fork for various police departments chasing illicit crypto related activity. The amount of stuff they can track including timing of transactions, entry and exit points, etc, and so over a long period of time means that most of the traditional anyonmization methods like tumblers simply do not work. Eventually someone, somewhere makes a mistake and the transactions and wallets can be traced.

If you have dirty money to hide, it's much better to hide it in a bank in Panama, or fill a sports bag with gold bars and fly it out on your private jet than use crypto.

Anything you can do from your bedroom, police can track from theirs.