>>cedill+Ny1
So what's wrong with that? You get warned, you ignore the warning and get hacked, that's on you for being dumb enough to download stuff from some shady website. Plus, Android is supposed to have decent isolation and permission controls, unlike desktop OSs like Windows or Linux (not counting Snap/Flatpak) where software can read your entire disk or any arbitrary file and send it via the internet.
Plus, you are not required to do that, you can just stick to Google Play and trust what Google approves there. But no need to lock down others because of your recklessness.