China has to accept that you simply can't prevent people from investing in Bitcoin. One way or another, there will always be a way for people to trade Bitcoin, even when it's not as convenient as trading on an exchange.
That's correct, China can't prevent their citizens from investing in Bitcoin. It is because every law has loopholes and peoples will get over it.
Every citizens of those countries (who banned cryptocurrency) are still in the crypto world, one way or another, they will stay forever.
Nothing can stop those guys who once stepped into crypto world. Bitcoin/cryptocurrency is the precious thing in the world now, who will let it go easily?