Because some countrys still thinking that bitcoin is bubble and use only for selling drugs and weapos or terrorysm financing , but soon they will see how new countrys accept cryptocurrency and bitcoin and will let the same things in nearest future.
It is either they ban Bitcoin or they regulate it. In our country, Bitcoin is being regulated and I think that is great since there are a lot of people that are taking advantage of it since we are a third world country. But I don't think that they will regret their decision since have a point of banning it and I we are lucky that our government regulated and not banned it.