Concerns from PBoC intervention earlier this year have made Chinese bitcoin exchanges be very careful when it involves handling USD or USD-related blockchain assets.
BitVC has been shut down, which was Huobi's futures exchange, but OKCoin.com futures are still the #1 highest volume Bitcoin derivatives exchange.
It continuously has market share of about 2/3:
This move hopefully will lead to sufficient segregation from any fiat operations and finally keep regulators off their backs.