Purely theoretically, China can take control of bitcoin, as He is one of the leaders in Bitcoin mining. But I do not think that he will do this, now China is more interested in creating its own crypt, which will be 100% under its control.
https://neironix.io/news/china_plans_release_national_dcrpChina cant take control of bitcoin no one can! That is the beauty of the network. Can someone theoretically 51% it yeah, but the economic incentive is not there to 51% it. How do peoe think that a single government entity can take over bitcoin...I dont think you understand how bitcoin runs.