Government can't control crypto because it is a decentralized system it can't operate from one place and can't make any difference to change one place flow of money. Government can minimize their people's investment by giving them restrictions. It is for some time because people will never stop using it and the system can't stop by anyone.
Also the government is wasting their time and taxes trying to shut down the networks and their exhcanges of this cryptocurrency because people will always find a way to make things work, we humans are genetically programmed to find freedom and struggle out of the control of tyranny.