Every bank does this now. It's not just when a guy enters a bank holding a sack with a dollar sign on it. That's why KYC rules exist.
Lots of money inside the system are laundered to avoid paying taxes, facilitate bribery, avoid confiscation, circumvent capital controls, fund terrorism, etc.
Lots of money inside the system are laundered to avoid paying taxes, facilitate bribery, avoid confiscation, circumvent capital controls, fund terrorism, etc.