Gold is not controlled by a government, but it's a poor currency given its physical characteristics, although it has been used as a common currency in the past.

Gold is not controlled by a government, but it's a poor currency given its physical characteristics, although it has been used as a common currency in the past. Cryptocurrencies are similarly not government controlled, but have better characteristics to make them usable as common currencies. The desire to use cryptocurrencies as currency is not by nature linked to crime, or tax avoidance, etc. just as owning gold does not make you a tax cheat. I own cryptocurrencies and I paid taxes on my trades, just as I paid taxes on my other capital gains.