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.
Economically it may not make much sense. But from a government point of view, it can make a lot of sense. They can spend a few billion USD and destroy the credibility and reputation of Bitcoin forever. But spending such a huge amount of money from this purpose can never be defended before the public, unless they can prove a credible link between either crime or terrorism with Bitcoin. Well... they will never get such a link, because it does not exist.