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 agree that they could not regulate the taxes becuase bitocin is decentralized and governments think that bitcoin is a scam even though its not a scam. In addition to that, I think that using bitcoin is a tax free. Lastly, I hope bitcoin will be illegal in all country in the world.