It depends on the law and regulations that you have in your local. Every country has its own regulations regarding cryptocurrency. Many countries doesn't have a clear regulation yet.
Yes it is really depends which country you belong with such lawful provisions to get paid taxes with your profit earned. Here in our country we've not forced to pay taxes because bitcoin users are not totally great in numbers but it started slowly growing right now, because people are aware the great benefit of bitcoin that helps elevate their financial stability.
Yes, it depends on which country or state you belong. In our country, there is still no clear ruling about the cryptocurrency taxation so we never know. I hope it stays like this
But sooner maybe, government will tax his like what India is proposing right now.Link: https://www.coindesk.com/india-considers-new-tax-on-cryptocurrency-trades/