All Apple policies make Apple more money. Not releasing a schematic, software to diagnose shit and forbidding selling of parts does not contribute to your device not getting stolen. All it does it make Apple more money because instead of having a thing repaired for cheap you are forced to either pay a lot of money to repair your stuff or buy a new product,

As I said I am sure the Apple car will have the tires DRMed , the excuse is to prevent stealing but the reason is to use only Apple tires, installed by Apple geniuses on your Apple car(probably will require also Apple only oils and even the water for your windscreen must be installed by a genius and be a special Apple water).