[smoldesu]

The alternative is a developer mode switch with a big "Don't Touch This, Grandma!" modal when you press it. People who want to install their own software do not conflict with your parents or the non-native English literate uneducated elders in your family.

[MBCook]

And what’s the first thing every scam will now tell people to do?

Turn dev mode on so they can install the “malware remover” or “fix the Facebook app” or whatever to be able to execute the scam.

[jeppester]

Child protection modes have had this problem solved since forever.

It's only a hard problem to solve if you are looking for excuses not to solve it.