https://money.howstuffworks.com/money-laundering1.htm
https://kyc360.com/article/money-mule-get-caught/
https://www.coursera.org/learn/forensic-accounting/lecture/ptLwZ/making-crime-pay-how-to-locate-hidden-assets-money-laundering
Now let's say money launderers were caught not due to cash but rather your magical powers, I would still be correct in saying that cash requires a physical identity to use; thus, no anonymity. There is no use arguing against that, it's a fact.