They have to improve their monetary policy. 75% of their wealth left the country in only a few years. To that effect, China implemented strict capital controls. A lot of rich Chinese are buying real estate in North America. With their government's tight currency control policy, they are not able to move enough money abroad to purchase those real estate. Bitcoin exchanges made it possible for them. It made those currency control policy useless. China doesn't dislike bitcoin, it's because this was one easy way for people to get money out of their country and into a mansion in Usa, Canada, Australia etc.