it's true but it's a country that has legalized bitcoin so that the government must determine the market for bitcoin users, but if the country that has not legalized bitcoin will not be the government asking for the slightest tax
I think it depend where countries you're from, if it is implemented or their is a law that you have to pay tax then that is the time we pay it. But i think if that will come, the bitcoin is already ligalized and many roles and regulation to follow.