Unfortunately this is a problem of electronic money. Physical money is hard to track in small quantities, but as the quantities get larger it becomes more obvious and harder to hide the suitcases full of cash. (Or, in the Iraq invasion, C130s full of cash: https://www.theguardian.com/world/2007/feb/08/usa.iraq1 )

Electronic money of whatever form is equally trackable regardless of the value of the transaction. That forces a world where either you can drop country-destabilising quantities of money anywhere without any law enforcement or every microtransaction ends up in the security services database.

Anonymous billions are all fun and games until the second plane hits the tower.