You said it, it's a huge untapped market, and if you want a piece of it you are going to abide by the rules imposed by the rule makers there. Just as in everywhere else.
That's a false equivalence, though. China's "rules" are much worse than most of the "everywhere else"s. Thus, they will continue to have trouble attracting foreign investment.
Though it would appear easier most "everywhere else" to voice dissent regarding "the rules". That and the prospect of redressing such grievances seem to be important distinctions.
Which is, perhaps, exactly how they want it.