Why make it illegal if you could just regulate it and get taxes from people who make money with Bitcoin?
That's a whole lot of revenue for the government that they would be missing out on if made illegal.
But Bitcoin is actually also illegal in a couple of countries:
https://atozforex.com/news/top-countries-where-bitcoin-is-illegal/I don't believe the government should profit from Bitcoin storage. It's absurd. I think it is reasonable to take taxes from those who trade bitcoin on the exchange. Let the exchange bring profit to the state, in the form of taxes. Let's say I'm a freelancer, got paid in bitcoins, and what should I give taxes to state ? What's interesting? To support the state and the Federal budget? It's unwise.