There is also another issue why Apple is restricting "part harvesting": theft. iCloud locks or Samsung's KNOX lock entered the field because the manufacturers were pretty pissed that customers using their devices in public became a target for "enterprising" robbers who'd factory-wipe the devices and flip them to a pawn shop or second-hand store in a matter of half an hour. When people are afraid to use your products…
But no, it is of course about money grabbing, and then the consumer is the opponent.