I'm not asking why China would limit it, I'm asking what Google gains from it.
If Google's top talent in China will mostly be poached within the next 10 years, is it really worthwhile to open a research center there? MSRA is a very good example, but at the end of the day, it's still a training ground for Chinese researchers. Paradoxically, the more important it is that Chinese researchers work on at Google China, the more likely that Google is to lose those researchers to government or private competitors.
If Google's top talent in China will mostly be poached within the next 10 years, is it really worthwhile to open a research center there? MSRA is a very good example, but at the end of the day, it's still a training ground for Chinese researchers. Paradoxically, the more important it is that Chinese researchers work on at Google China, the more likely that Google is to lose those researchers to government or private competitors.