You could even make this an installation-time option. If you want to enable the switch afterwards, you have to do a factory reset. Then, the attackers convincing the victims would get nothing.
Or make sideloading available only after 24 hours since enabling it. I would enable it on my new devices and wait 24 hours before installing F-Droid and other apps. Not a problem. Scammers might wait one day too but it decreases the chances of success because friends and family members can interfere.
But I'm afraid that this is security theater and the true goal is to protect revenues by making it hard or impossible to install apps that impact Alfabet bottom line (eg third party YouTube clients.)
> But I'm afraid that this is security theater and the true goal is to protect revenues by making it hard or impossible to install apps that impact Alfabet bottom line (eg third party YouTube clients.)
It's not just them. Every other SaaS, from banks to media providers to E2EE[0] chat clients to random apps whose makers feel insecure, or are obsessed with security [theater] best practices, just salivate at the thought of being able to check if you're a deviant running with root or debugging privileges, all because ${complex web of excuses that often sound plausible if you don't look too closely}. There's a huge demand for device attestation, remote or otherwise.
In the case of most of those business it's only because they must mark checkboxes on a regulation compliance sheet and/or deflect blame on someone else. The problem is that this is a never ending spiral of regulation after regulation and new ways to deflect blame so after device attestation will fail to solve all of their problems they'll end up pushing something else.
That's... brilliant. Enough work to not be able to talk it though over the phone to someone not technical. A sane default for people who don't know about security. And a simple enough procedure for the technically minded and brave.
It solves the 'smartest bear / dumbest human' overlap design concern in this situation.
But I'm afraid that this is security theater and the true goal is to protect revenues by making it hard or impossible to install apps that impact Alfabet bottom line (eg third party YouTube clients.)