Are you wanna putting the chinese investors into the risk? Even a big service like binance are getting banned there. What makes you feel if that service is safe to be used by the developers? We have seen so many times china's regulator shutdown so many services. Remember if that is on the sensitive country's territory.
I thought that if you can tell us what was the reason is much better than provide what you offers in your service.
In China, it is forbidden to open an exchange, prohibit ICO, IEO and other content in the local area, rather than prohibit Chinese people from trading in external markets. Just as trading platforms such as binance and huobi open trading platforms overseas, they have their own blockchain industry in China.
Most of the trading crowd and the Chinese people involved in the transaction account for a large proportion.
In addition, mining is not explicitly prohibited in China.