That may have been a half decent excuse for parents 2 decades ago, but it isn't very good now when current parents grew up in the computer age with computers at school and in the vast majority of homes and even 90 year olds are using smart phones daily.

Like I said, likely less so today. That said, there are still a LOT of people that can use their devices, but have no understanding of security, configuration, etc. My SO can't even handle a password manager, but she can manage live TikTok chats/streams (or whatever they're called) with ease.

That said, it could definitely be done relatively easily at the carrier level, and a really simple addition to browsers, even if only on mobile devices.