Those camps didn't build themselves.

Technically, especially Muslims. The per capita amount spent on securitization, reeducation, labour transfer (jobs programs) for the purpose of sinicizating restive muslims population is massive.

that this is an extreme oversimplification of the Xinjiang issue should be obvious given the fact that other Muslim Chinese minorities like the Hui in China enjoy relative religious freedom. (in fact the issue is assimilation into China's ruling class, not religion per se). In fact inter-Muslim wars in China itself have a long history between different Islamic groups. Also of course the (lack of) response from the Muslim world in general to the Uyghur situation should make clear that the situation is somewhat more complicated.

What do you mean? China invest heavily in Xinjiang. Xinjiang GDP is 19th on the list https://zh.m.wikipedia.org/wiki/%E4%B8%AD%E5%8D%8E%E4%BA%BA%...

Per capita GDP is similarly ranked.

And there are 56 minorities groups in China, they were all have specific aid program, like preferential treatment in national college exams.

What's the basis of such a wishwash statement on China and the people? Are you suggesting Chinese people are practicing racial segregation? Or what exactly are you suggesting?