who said BTC mining in China is illegal? It's impossible!
Looks stupid but according to my friend it is legal to produce mining equipment but mining BTC and using it illegal. I am also surprised @Monday, he will contact with a legal department of his firm related to subject and I will inform you about the situation right now, everything I am going to say will be an assumption
China only says that bitcoin is not currency and restricts the banks and financial institutes to provide btc products and services, nothing more!