In general, if there is no tax for what the government will contain, and if there is no government, there will be no state.
Taxes can only be reduced to a minimum.
Add up to this statement that paying a taxes must be depends on the laws of a country like in America that is one of the largest user of cryptocurrencies, they pay taxes for transacting their invest in a certain cryptocurrencies and this is a fact that without taxes, the governments will encounter a lot of problems in terms of funds.