BitVC is owned by HUOBI, the order book shown in BitVC are actually order book of HUOBI exchange. Thus, don't worry BitVC will run away with your money.
But wait...doesn't huobi have 0% fees also?
How does Huobi make money?
I believe they charge you to withdraw your money.
Quote
Bank card withdrawal fee 0.3% - 0.5%, cash credited within 24 hours
Providing loans to users for leverage trading as well