They ban an app from the AppStore, you can’t get updates but you can still use the app that’s already installed.
Not if the the device is serviced or reset due to software malfunction and the app is banned as there is no other way to install the app. But even if it was possible, software updates is an intrinsic feature of software, the way software works. So it is effectively removing third party software, with their own licencing that is not their property to govern, and than again from property that is not theirs, case in case iOS devices already sold.
The trick as you so well pointed out that Apple is applying is at one hand in the paper, that you get to see after the boxes are opened and the devices are running, state the the license that came with the device is disassociated from the device itself, but as a product they are one and the same, from product design down to marketing. If you don’t get one, you also don’t get the other for the purpose the product was sold. This division on paper, it’s a trick and its fishy in Apple context. They are using a standard business practice in WinTel like ecosystems, when their business does not operate in anyway similar.
This can be done because the entire industry is mostly unregulated. It’s no law land. The result is that people are loosing more and more power over their property than ever, wether that property is a license to use a digital asset or a device. A power transfer to Big Tech, that with a switch of a button can turn a thousands dollar device in paper weight, protected by what they wrote on paper, just because.
PS. Apple is not the only one doing this by the way, but the one doing it at its extreme.