I'm speaking of crypto of course.

"Oh, you transacted and it flowed through an offshore place, to or from an offshore entity?  Pay up."

And let's not forget that every transaction is traceable, with mathematical certainty so there is no denying you did indeed transact.

Oh, the transaction crossed a border twice (one to an exchange and then back to you)?  Pay twice assuming both nations levy a tariff, of course.

Try to evade paying?  Why that's a criminal offense (tax evasion) so now you get to pay up and go to prison.