Well, Apple is a hardware company first and foremost, their business model is to sell you a Mac regardless of how little you use it. Letting a third-party rent

Well, Apple is a hardware company first and foremost, their business model is to sell you a Mac regardless of how little you use it. Letting a third-party rent a single hardware unit to hundreds or thousands of people per month and capture most of the profit while doing so is against their business model, so not surprisingly they try to prevent that from happening.