bitcoin holders in any country as per their country rules they should pay their taxes on the time it is good for cryptocurrency industry and for country economy paying on times tax will bring more ease in doing business
This only happens when a government accepts bitcoin and sees it as a commodity. And now I do not know about any such government. this is ridiculous!
Unfortunately you have lack some knowledge and recent updates. You should listen to news and read latest articles in order to stay update. Bitcoin has been successfully recognized by so many developed countries of the world such as America, England, Japan and so on. Recently Germany has also recognized bitcoin which means it is legal in these states. Bitcoin is decentralized so no one can put tax on it.