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by Ambroos 667 days ago
Apps still don't have system level access to anything, so no. iPhone apps can't automatically run in the background, run on boot or just access random data from random apps. If they can it'd be an exploit, and while the App Store gives you some extra safety in that they can scan for it / pull the app without updating iOS, now you actually need an up-to-date OS.

It's a small additional risk but really not that big at all compared to what you can do with Android sideloading or app installing on macOS/Windows, and not comparable at all to macOS kernel extensions or Windows drivers.