What of people have, like, free time?
For me, education was the worst part of my life and the Internet perhaps one of greatest.
The problem isn't necessarily the device, but the content
Kids spend up to 10 hours per day on screen, most of it on smartphones [0], and they're not reading encyclopedias
Average tiktok user screen time is over 25 hours per months: https://wallaroomedia.com/wp-content/uploads/2022/03/tiktok-...
[0] https://i2.wp.com/www.surexpositionecrans.org/wp-content/upl...
For starters, the 1.5 hours ot TV may go.
My kingdom for the ability to allow-list what my kids can watch on YouTube. I'd pay double what they charge for YouTube Premium just for that. Youtube-dl'ing the videos and putting them somewhere easily accessible is a giant pain. There's great stuff on there but YouTube makes it so damn hard to curate it.
Then, for your kingdom, you will be able to afford building an app that plays YT videos only if matching some regular expression based on your whitelist. You can apparently stream YT videos through the ExoPlayer library or other tricks, see e.g.
https://stackoverflow.com/questions/29607104/how-to-play-you...
My son can be interested in an animal, so he'll find some youtube videos of the animal to watch. This is ok because the videos he searches and clicks on are fine, usually some sort of documentary. But then the algo. within like 3 videos he's watching badly autogenerated X vs Y monsters fight bullshit videos and it just gets worse and worse.
I'm seriously tempted to set up some sort of network MITM proxy that blocks any YT URL where the HTTP Referrer is a previous YT Video, so that algorithmic suggestions can just fuck off. Searching for and watching a video would be fine.
I think even if you got rid of the attention economy though, smartphones would still have negative consequences. A smartphone will help you kill some time, even if you're just browsing wikipedia. I think sometimes it's good to be bored, it can spur you into doing something new. Now we don't get bored, we get placated.