The Chinese government is subsidising the car industry to outcompete and destroy other manufacturers. These cars are being sold for less than they’re worth. This is why the EU is banning them. Its the same thing when you in wish and order something for 3 dollars. The Chinese government subsisdises the postage in China and international law means your post has to deliver it in your country.
They don’t really work all those hours. If I’m to guess, there’s napping, long lunches etc included. I bet you most countries are more productive in 40 hours.