2. About the legality of BTC in China. Please understand that there is NO law in China. CCP rules everything. All businesses are running more or less in grey area, and is definitely so for BTC business. If CCP find BTC threatening their dictatorship, they will shut it down next second with no mercy (at least the exchanges, not sure if they could really shut down the bitcoin network itself). Therefore, I will never leave a single satoshi and a cent of CNY on any Chinese exchange for more than 24 hours.
Let me just say this: I would not leave any satoshi nor any cent in any exchange for longer than strictly necessary.
This is actually an argument for why the Chinese government should not feel threatened by Bitcoin. When most businesses in China are operating in a grey area then Bitcoin will be no different from what is already happening.
Also, China really stands to gain from working against international finance. Also supporting the Bitcoin technology can help them make further advances in Africa for example. Embracing Bitcoin could really help China use this soft pressure they like to apply to slowly by slowly build more influence abroad.
Even if the Chinese government hasn't fully grasped the potential of Bitcoin (unlikely, but possible), strategically it makes sense for them to embrace it, and hence they will gain the understanding in the future and not work against it.
The US, on the other hand, is in bed with international finance and will have a much harder time than China embracing it - hence the advantage is with China and thus they will take the advantage and make sure they get the lead in yet another area.