You don't give permissions to an arbitrary Android app because you don't trust it, whereas GNU Emacs can be fully trusted, (unless you run untrusted Emacs Lisp

You don't give permissions to an arbitrary Android app because you don't trust it, whereas GNU Emacs can be fully trusted, (unless you run untrusted Emacs Lisp code, ofc). I even tend to think it requires too few permissions, e.g. it cannot initiate phone calls. If you don't trust the F-droid build, you can always build it from the sources.