The scams this directly targets are well known and common. Someone gets a phishing message, they have someone install some sort of malware on the device, then their bank accounts are drained into some offshore account never to be seen again.

That's why there's a requirement for restarting the phone and waiting 24 hours.

The restart ends the connection for any remote-access software or phone call that might be driving the operation -- and the 24 hour wait period breaks the "urgency" part of the scam that prevents other people who know better from stopping the vicim from continuing.

Had to read that sentence twice. You really think that there's more people getting scammed via "please tap the build number seven times and then go to extra settings and enable untrusted installs and then go to this website that I will dictate the URL of and you should ignore that install warning" etc etc etc. to install an apk to run software that can barely access more than a simple webpage could, than there are people (like HN'ers) who install apk files from github and f-droid?!

(Also note that "crapware" describes basically every app you find in google's store. I try on occasion, when nobody made an open source this-or-that, and it's such a minefield. If that's the thing you're trying to avoid, I don't know how you could possibly feel positive about a requirement to only use the Play Store for the tech-illiterate)