Unless they own the computer, it's not reasonable to disable it because their service is not used. Taking steps to actively, for no technical, or ( for me ) functional reason is such an customer hostile idea, that I can't really understand how it can ever be seen as reasonable?
Their brand being tarnished is of no concern to me as a consumer and user of their product, and neither should it. They do with their brand as they wish, and I with the product I bought as I wish. If a producer wishes otherwise, they simply can't say, or claim that they are selling the product.
It's really just a simple case of Apple trying to have the cake, and eat it too.
That, and that Apple these days seem to be doing everything in their power to make their brand into a luxury brand, and you obviously can't have a luxury brand that the less well off can actually buy, and afford to use, even second hand. Some satire yes, but nevertheless how luxury brands mostly works.