Comment by sigh_again

The java.io.File API isn't removed from Android, nor inaccessible. You can absolutely still use it. Google Play has chosen to not accept it on their store unless you justify it (to their non working bots). In this case, the dev chooses to just drop the entire app because maintaining it just for Fdroid feels pointless.

There's very few permissions on android that are system/privileged/preinstalled.