Who knows China may even be investing in BTC. All they have to do to manipulate the price is to ban the crypto every few years and then make it legal again a couple of months later.
Once it's banned China can buy on the dips and sell off at high points or just accumulate over long periods.
That's always a possibility - even with people that have a couple million laying around can fluctuate prices of the smaller altcoins. The good thing is that China is no longer a factor in the Cryptogrowth. It's Japan and Korea.