To take control of bitcoin, you need to take control of 80% if not all the networks and even at that moment, you'd still need a lot of power and money (for the equipment) to be able to pull it off and China's lacking in money already if you're keeping up with the Chinese stuff that's reported by investigative reporters so I don't believe that it's in their agenda to take over the bitcoin network anytime soon, pretty sure that whatever they're doing now, bitcoin or any cryptocurrency has no relation to it or anything like that.