People pay taxes because they have no way out. For non-payment of taxes can give a prison term.
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.