This is the wrong policy for China regarding cryptocurrencies, they should stop.
What can you do to stop them? Go and tell them to stop this because this is not the right way?
China has the right to do it because they know the risk of having a cryptocurrency for trading. They are now focusing on making their own centralised cryptocurrency that only the government can handle. I don't know what would be the result of that but chinese people would eventually support that.
You are right, we cannot control the Chinese people and we need to understand that the impact of china over the bitcoin is low. They can implement whatever rule they think is good for them and if they want to restrict the use of crypto in their country, that will only harm them.