Almost all of the major economies are taxing cryptocurrency income be it capital gain tax or special tax just for cryptocurrencies. Since, cryptocurrencies are pseudonymous, government is tackling this problem by getting the details by the crptocurrency exchanges. Today, cryptocurrencies are the market of $373 billion. The amount is huge enough that government can't neglect it. I see more regulations and taxing by more countries in future. Else, there will be a major shift of investors and traders to cryptocurrencies that governments all over the world don't want.