However other brands in China also obey the same law, that means you have to choose some brands that never have business in China, which excludes (Samsung, LG, Moto, ....)
It's not necessarily a sampling issue. Of course they could work with scientists that go back. You work with them, then they go back. The implication is clearly that the parent could have already worked with scientists that have gone back and that isn't occuring.
Building a search engine to replace Google is too hard for even Apple to pull off. Maybe in the future there will be a different approach to solve the search problem and Apple could so sth about it. For now it is not possible.
Apple is not a small startup anymore, it can not even replicate DDG