I would rather pay tax on my crypto currencies than having the governments banning crypto. Lets not give the governments another reason to disallow us using crypto. Anyway, it is good to contribute to nation building, isnt it?
And how can they forbid you? For example, you live in the Netherlands, you are engaged in crypto and if it is forbidden what prevents you to go to Germany to withdraw your money, or if you have friends or relatives can transfer money to Fiat and send it to you through the Bank. It is impossible to prohibit the use of crypto, they can simply create some difficulty for you to withdraw to Fiat money.