Why can you keep getting updates for already installed apps on older iPhones and iPads

why-can-you-keep-getting-updates-for-already-installed-apps-on-older-iphones-and-ipads

But you can’t install the app even though you would get the update if you had installed before the cutoff version?

Is there a technical reason for it or is it just apple saying eff you pay me?

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Categorized as Apple