The value of those "brands" are based on perception and the existing brands have put a lot of work into cultivating their brands historically.
https://www.newyorker.com/magazine/2018/04/16/the-chinese-wo...
https://forum.purseblog.com/threads/inexpensive-immigrant-la...
On a side note, this also applies to some "Made in America" brands too. Some of my favorite American brands used to host factory tours for their customers -- they tended to have a majority if not all southeast/east Asian workers making their garments and bags.