It may works if all countries have same jurisdiction or major laws about taxation. There are countries who restricted cryptocurrency and some wants some regulation to it. The crypto tax calculator is good and helpful for us yet we can't use it because we have varieties of treating the tax. Tax is helpful in a country specially right now wherein the government have few treasuries left because of pandemic. But for me, having a tax in cryptocurrency industry creates too much hassle for us. The best thing they can do is to regulate the exchanges in order to pay taxes on time.