Possession of stolen items and/or child porn is all that is required, no matter the reason. Crypto mining would probably be considered a you problem, unless your phone is owned by an employer. Each app has its own storage and can access shared storage.
https://developer.android.com/about/versions/11/privacy/storage
Access to data directories on internal storage
Android 9 (API level 28) started to restrict which apps could make the files in their data directories on internal storage world-accessible to other apps. Apps that target Android 9 or higher cannot make the files in their data directories world-accessible.
Android 11 expands upon this restriction. If your app targets Android 11, it cannot access the files in any other app’s data directory, even if the other app targets Android 8.1 (API level 27) or lower and has made the files in its data directory world-readable.
The OS seems to enforce this but is above my pay grade. A custom ROM no doubt would work.