Yeah, government is always after the taxes they can get from the people. So, I will not be surprised if one day bitcoin or cryptocurrency will also be taxed in any way that the government knows.
Apart from a handful of countries, everywhere else you need to pay taxes on their gains from various investments. Cryptocurrency is no different from the other assets, and in case you are profiting form investments in crypto, then you need to pay taxes on those gains, as specified by the tax authority. In this way, the government also benefits from Bitcoin.