When someone begins a sentence with everybody knows, I often found that not everyone knows.

Are you saying all of China's industrial output is done with slaves?

Because it's funny the Wests answer to this is move to parts of the world that pays even less

Yes, western or more correctly, international companies are keen to take advantage of slave labor even in 2020, this isn't even slightly controversial.

Once upon a time there was colonialism, now it is neo-colonialism. However, think from the perspective of the countries, even if the leaders are influenced by short term thinking and Chinese bribes, they will undoubtedly feel that having Chinese money in is better than nothing.

The Iran-China talks for 400 bn $ investment is the latest example.

Also people feel that slavery or cheap labor will disappear if people stop buying, boycott brands etc. The unfortunate reality is that people will do what they can to survive. Although in the case of China, they use it more as a method for cultural and economic subjugation. I am not sure how bad the conditions are, but i can definitely wager they will not be as bad as many other poorer countries. So from the perspective of an average Uighur person who wants employment and peace in life, it might even be a step up.