First off, most governments consider it either property or currency, so you actually do have to pay taxes on it if someone pays you for a job in it. If you have cryptocurrency that makes capital gains, just like 50 Cent, you have to pay taxes on those capital gains as well. Cryptocurrency is also regulated by multiple agencies in the United States, namely the SEC, as well as some governments in other countries, while other countries like Egypt have banned it outright.
Infographic by: coincentral.com