Couple of things:
SOX, Frank-Dodd and Chinese attempting to set themselves up as the premier business environment.
Anyone consider that these companies came public on the US exchanges so they could get a much better price for their shares via the IPO. The US investors have a lot more investable money and US brokerage firms will place deals, no matter what the quility of the deal (remember FaceBooks recent IPO?).
Then with these new riches, let the share price decline and then use the money from the IPO to buy back shares and take it private.
Basically, they “used” the US stock market to make zillions that they couldn’t have made in their own markets and can now use these riches to take them private and keep the money they raised.
Diabolical perhaps, but it is clever.