Governments control the Fiat currencies. They use central banks to manage money holdings, using so-called monetary policy. They also determine how remittances need to be implemented, which allows them to monitor the movement of the currency, and also dictate who benefits from this movement, collect taxes from it, and track criminal activities. But all this control is lost when non-governmental organizations devise their currency.
Control over the currency has many different hidden currents, especially in the framework of the fiscal policy of the country, the business environment, and, of course, crime control.