BTW anyone else suspecting the Chinese exchanges to be almost completely fake? There was just dump, flatline, dump, flatline. The volume was also completely ludicrous.
PBOC should have shut them down a long time ago.
Since the Nov/2013 bubble I saw only two articles where the reporter actually bothered to find out who were the Chinese who created it by buying all those coins. Not in the bitcoin media, of course. (The most informative one was in the Christian Science Monitor, of all places.)
The Chinese who have been setting the price of bitcoin were day-trading funny commodities before, as a form of gambling. They just moved to a new asset that was a lot more volatile, and did not have complicating isssues like quality grades, location, shelf time, etc. (all hail to 'fungibility').
So, my guess is that the Chinese government does not care anymore about what happens on the exchanges, because it is no different than what was happening before bitcoin, with the speculation in those commodities.
The PBoC does not care any more, because bitcoin trading is confined to the exchanges, and cannot interfere with the role of the yuan in e-commece and with the banking and financial sectors -- which is what they care about. Some other parts of the government were concerned with criminal use of bitcoin, but the exchanges got scared into fully cooperating with the police through AML/KYC. I believe that they also got a scolding from some other sector of the government about their attempts to market bitcoin to the masses, so they pulled back on that too -- no more sponsoring of bitcoin conferences, and no more open houses featuring the Bitcoin Goddess.
In short, the Chinese government must now be worried about the fairness of bitcoin exchanges to the same degree that they worry about the fairness of the casino tables in Macau. That is, not at all.