Sometimes they can't control their emotions, just like China's policies are introduced one after another. Most Chinese crypto enthusiasts will choose to sell their tokens. News in their own country will make them more psychologically affected and pressured. Chinese miners also choose to move out of China, so they need to be psychologically prepared for unpredictable situations in the market.
Every single year China make these moves all over again and I think they intended to do this to manipulate the price of BTC & other cryptocurrency. There reasons are the same every year they just relaunch the same issue about cryptocurrency. But in the other hand, they secretly make their move to create their own digital money to use it in there country. We totally saw how China have big impact in cryptocurrency. Best time to buy for us.