Nope. Imagine dev is dead, I could still use his app on windows, often 10 - 20 years after release. Apple model is different, it killed these apps, and users don't have much choice on such tightly controlled platform.No the Devs killed their apps.
Now tell me nice story how dead developer must support his/her apps (I use extreme example to make you understand that it is Apple decision). Again - I don't know if they right or wrong. I personally use Windows on my Macs, migrated from iPhone (but not from iPad yet) and don't use Apple only services, so I would not be tied to Apple ecosystem, where I don't have control or choice.
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Because they were not profitable, because developer died or moved to something else. Useful not equal to profitable, developer has no obligation to continue to support app forever, Apple also has no such obligation.If they were that useful then why did the developers abandon them?