member of those MMM ponzi scheme will just buy and sell Bitcoins, they don't keep those Bitcoins since they just send it to another address then wait for week then request for withdrawal with interest then exchange since Bitcoin is not that mainstream yet in China.
From what I understood, they would not get the returns immediately, so could be sometime soon. Also highly depends on when the ponzi operator cashes out. He could dump his holdings too. 1 week is the soonest that they can dump Bitcoins, the longer they don't withdraw the bigger the interest, that's why some have multiple accounts there. If i'm the ponzi operator, I can easily assign my BTC address to anyone and they will send Bitcoins because after a week, they can withdraw with interest. It's a circle.
