iPhones get used for longer period of time by multiple users and they carry high resale value, if they let devices with fake components they will eventually tank resale value as people will not trust used iPhone.
I support right to repair, but ONLY with genuine parts with warranty. I want Apple to provide cheaper display replacement just like they do with batteries. As long as Amazon, EBay, and small repair shops keep selling fake iPhone displays and batteries there is no way out of this problem.