For context, the app (Piezo) in question was removed from the Mac App Store (not the iOS App Store, as I first assumed on reading!) by its developers. It's an

For context, the app (Piezo) in question was removed from the Mac App Store (not the iOS App Store, as I first assumed on reading!) by its developers. It's an audio recorder which can record audio from other apps. The App Store introduced a sandbox which prevented the app from working, but they got around that by simply not updating the app and thus retaining the ability to work outside the sandbox. However, other apps introduced changes which broke Piezo, and which needed a fix which couldn't be distributed via App Store, finally killing that methods of distribution. https://weblog.rogueamoeba.com/2016/02/12/piezo-1-5-arrives-piezo-exits-the-mac-app-store/ https://weblog.rogueamoeba.com/2016/02/12/piezo-1-5-arrives-...