Yeah. Like the fiat money is not being used for criminal purposes Cash is even harder to controll than cryptos, and bitcoin especially as it is not 100% anonymous. Authorities just dont like internet and related themes, as a "techy-sketchy things for kids trying to cheat us".
That's why they are trying to get rid of physical cash too...
http://theeconomiccollapseblog.com/archives/they-are-slowly-making-cash-illegal
Slowly the powers at be are turning the world into a giant police state.