Given that it is within the power of the Chinese Gov, to ban or at least ban all Chinese companies from dealing in Bitcoin, why have they not simply banned it?

it seems strange to me as to why they would put the "hurdles" in the way of bitcoin development within China, that are now seeming more anti bitcoin, yet they have not made any mention about banning its use outright (rather the opposite).
I dont think that it is a case that they "dare not ban" bitcoin, in a similar way to how a western gov may react, as china are very use to banning things that do not "meet in with their plans for the country".

Just wondering what other people think, as i find these actions "strange"....

Thanks
Ford