Some countries limit the transaction of bitcoins but not totally ban them. But any limit or ban can not stop using bitcoin or stop bitcoin transaction as long as people gets benefited from it.
If the government of any nations like let them banned or reject the use of Bitcoin, bitcoiners still remains strong as one community, one people, one mindset, we are not going to give up on bitcoin until every nations pulling out comes back to it and bitcoin will accepted legally and globally.
Actually, they technically can't stop people from using bitcoin and that is the reason the bitcoin community will still remain strong. Unless they start monitoring peoples personal devices which I don't think will not going to happen.