They do this because they can't control bitcoin, ICO and getting taxes from crypto. At the moment there is no necessary legislation to effectively regulate crypto and protect people from scam. I hope we will see a solution to this issue in the near future and China will be able to fully return to the market.
We hope that China will be able to return the Bitcoin to the market because China is the world's populous country. Many chinese people will be able to use Bitcoin and that is the big advantage, we also need investors from big country and also a people who have a great intelligent about business world.