It seems to me the main reason why the state loses cryptocurrency is the loss of control over the economic sphere. Since the nature of bitcoin is contrary to the nature of statehood.
Well if regular people can take advantage of cryptocurrencies, why can't politicians? I mean, it's anonymous nature cam be of well used for corruption. Let:s face it, as it stands, we can't run from corrupt politicians running our country.
Because normal people can't be corrupt. To be corrupt you first have to be a person of power, a policeman, politician, judge, or any other civil servant. Money that leads to abuse of the powers given to you by the voters makes you corrupt. If a normal person uses BTC to gain advantage, hide income, leave the country, it's not that great, but when a politician does the same it not only abuses the trust given to him by the people, it kills the trust in the system and through it it kills the system itself. Corruption ultimately leads to loss of power and anarchy.