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/That is only idiot government that ban bitcoin, if all countries ban bitcoin all government are idiot. What should they ban, exchangers, or bitcoin network, if bitcoin network, they can't they can ban exchangers. Not all governtment are idiot. I don't think any government can stop the growth of bitcoin with million users or holders now.