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.
You are obliged to pay tax if the Government says so. Here in my country, the Government does not legalize bitcoin and we are not obliged to pay tax. However, the central banks regulate the virtual currencies to avoid money laundering or any illegal activities. Anyway, is there any country that legalized bitcoin? Because as of the moment, I haven't heard a country that legalize it.