The thing is, they can't shut down Bitcoin unless they take out nearly the entire internet along side it. It's been decentralised in a way that makes that near impossible.

They can cripple it, sure, but decentralised exchanges exist, and an attempted ban of bitcoin would just bring even more attention to it. It would be ultimately be a good thing in the long run if a major government attempted to ban Bitcoin.

An attempted ban by a major government is essentially a massive stamp of approval saying that the technology works and they can't control it.

Just look at Russia, they've been trying to crack down on cryptocurrencies as well as usage of privacy tools like Tor, I2P, and Freenet. The results have been a complete backfire so far and have lead to even more usage.

You can see Tor's usage increasing in Russia over the last three years here. I expect tor usage will go up even more with the upcoming release of Tor Browser 10.0. If you're in a country with uncensored internet, I highly recommend installing Tor's Snowflake extension as it will help out those who do have censored internet.