Then why not check on it occasionally and put a hefty fine on it when they fake the documents? If you cannot make a new and important law because rich people will try to bypass it than the state is useless.

The problem is, paying fair wages, sourcing fair materials und make sure the phone ist repairable and lasts longer will always be more expensive than let’s say Xiaomi. If the phone lasts for example six years instead of the usual two they will only sell a third of the phones other manufactures will sell, even if they reach the same customer base.