I think this is the reality that we should pay tax for that all type of money which we are making earnings Because that money will go for the development of your own country only and that money will make your country grwo easily .
And also if we are making earnings in bulk then surely there should be tax system but if we are limited with small amount of earnings then I don't think that we need to pay tax at any side .
And also here we should take care that if the government of our country are allowing to use cryptourrency with tax then we should use without any problem or quarrel Because there are many countries which banned cryptourrency , so it will be more better to make use of cryptourrency with under the government laws of your country .