I think that depends what you mean by "biggest", as the US is richer and both India and China have more people. I think Apple sales in China and the EU are about equal, and that US are significantly higher, but my info may be out of date and was merely a summary in any case.

But I would agree, they're not likely to just give up on the market. Even ignoring the likelihood of similar laws everywhere else, it's too big and too tempting.