This is worst if you are caught then you have to face some serious issues not only financial in many other ways as well because it's already happening in few countries where crypto is illegal they are giving them long term prisons fines and having their all assets as well because few months back I have one friend who was caught then he lost some good amount and until now facing some serious legal issues as well.
If some country banning crypto then you have to follow rules very carefully because this is not easy to do this all under this judiciary. Sometimes they have fake traders or things like this for having all updates about these crypto related peoples.
There is a difference between
de facto ban and
de jure ban. In China, the ownership of cryptocurrency is under
de jure ban, but millions of Chinese residents continue to use it. And for the government, it is not practical to go after all these people, when the majority of them deals in amounts less than $100. The authoritarian governments may follow the approach that is being used against media piracy. They may arrest some random big fish and hand out extremely hard punishments, and then hope that it will deter others from dealing in cryptocurrency.