not all countries prohibit bitcoin, many countries have legalized bitcoin in their countries, and I hope bitcoin is not banned in all countries because bitcoin is very helpful to the economy of its users, even though bitcoin is at risk of being misused, but actually bitcoin is much more useful if used positively.
It is true that it can help other people to earn some money but it is not that easy since to earn a profit out of these crypto currencies, you should be able to have virtue of being patient. If you are not patient enough, you will not be able to earn money in the future. If the government banned them, I don't have any thing to object there since it is their decision, not mine.