Literally the new attack vector I described above. It’s one more thing to worry about.
Scammer: Madam, go into your settings and enable side loading. It will then connect to your bank account and I will…
Madam: Okay uuuuh... A big popup came up... It says... That I should not enable this setting unless I really know what I'm doing... And if someone is telling me to enable it then I should hang up the phone!!
No amount of software red tape is going to prevent scammers from sideloading malware on a device of a victim who trusts them. The only realistic way to actually prevent it is to not have sideloading as an option in the first place.