Apple should have a disclaimer in the description for "premium" apps like these. Something like "This app can be remotely deactivated by the developer". I think it's obvious that free to play games can be shut down at any time, as well as subscription-based apps. But when you pay for a premium app, or for an IAP to remove advertisements you don't think that the app will just "stop working" one day - unless you update the operating system. I've bought several "premium" games that require a download the second you launch it in order to get the content. And (I could be wrong - please tell me if I am) it seems like in some cases, the download comes from somewhere other than the App Store - otherwise a developer "shutting down the server" wouldn't affect it. I was under the impression that apps weren't supposed to circumvent the App Store in this way (side loading, in effect) and all content goes through Apple's servers. For example, I bought Pac Man Premium in 2013 and spent $15 on IAP to get some extra mazes. Old school Pac-Man gets boring quickly, so I didn't touch it for a few years. When I re-downloaded it, I found out that it was just a "shell" and that the mazes were no longer available because Bandai-Namco abandoned it and made a new version. Up to this point, I had thought that all IAP resided in the .IPA file, and a "restore purchases" would unlock the functionality you paid for - unless Apple went out of business, of course.