Governments can ban anything within their borders. If so, you wouldn't be able to legally transact using bitcoins without some penalty if you get caught. Perhaps there are dark markets where you wouldn't be caught, but this would severely limit Bitcoin adoption within that country.
Agree only those government can only ban bitcoin.within their borders . There are country that is banning bitcoin because of its gambling activities because they are using it to gamble and I think.it is a sore to them and.other also using using it in.deepweb markets though it is not possible to ban bitcoin all over the worl because there are few country that they legalizing bitcoin.in their country