The Russian government carries out active actions for introduction of new taxes in the country from this point of view legalization of cryptocurrencies and the subsequent taxation of this branch it is quite real.
Fundamentally disagree with you, cryptocurrencies imply anonymity and decentralization, no control of the state in this regard will not. Are you saying that the government will build a shadow economy with its own hands? Then they will not receive any taxes at all. This will never happen. But to catch all crypto anarchists and send to cultivate Siberian land - that the government will do in the first place.