Comment by asimovDev
9 hours ago
Apple is not good with backwards compatibility to my knowledge. If you buy a 'done' app it's basically a subscription (albeit much cheaper) for maybe 2-3 years because a yearly iOS update will most likely introduce breaking changes, as someone below me already outlined.
It’s still cheaper to buy the same $2, hell, $20 app again once the compatibility breaks than keeping all the subscriptions going on forever.