Incorrect. Original Design Manufacturers *design* and *patent* what they've designed. Apple designs and patents their own equipment.
They do outsource the manufacturing to companies like Quanta, Keytronic, and Foxconn, but that doesn't mean they wear the pants in the relationship, and they would be beholden to Apple to determine who they could or could not ship or sell units to. Purchasing from Apple is essentially a direct purchase without a third party.