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I suppose you’re talking about a 32-bit app that wasn’t updated for the newer 64-bit architecture. If yes, then there’s actually a technical reason behind it, not just Apple being dicks. Because other than 32-bit apps, every app that received a 64-bit update should still work on the latest iOS.
Apple TV is a bit pricey, but at least it’s ad-free. Connect it to a modern TV without internet access, stream your Jellyfin (or Plex) media via Infuse and you are good to go.