If the Apple logo is on a part then the manufacturer likely made that part for Apple under some agreement and the manufacturer is not permitted to make more of those exact pieces for other buyers.
Also if those pieces were made for Apple and didn’t pass QA, then the manufacturer can’t just sell them. They have agreements to destroy them.
If the Apple logo is on a thing then it’s a counterfeit someone is trying to pass off as real or an official part that “fell off a truck” or didn’t pass QA and should have been recycled or something…
If I legitimately paid a manufacturer for a compatible part to be made, I’d expect no logo on it