They just did but not all of them actually. There are a lot of countries that banned Bitcoin for also a lot of reasons and we can't blame them since we have a different points of view to anything and that also includes cryptocurrencies.
Government are still not comfortable on cryptos, even our country that regulated cryptos still warn us from using it to crime activities proves that they are still not that comfortable to it. I know that Bitcoin transactions can be tracked so I think maybe this is just a trap for criminals so they can catch them, we we don't know how government run their minds.