If you spend 4 hours/24 hours on your phone then every 20X you'll have lost 3.33... X.
I think the author is using year and waking-years but it doesn't parse well for me because you don't get close to 20 waking-years for every 20 years.
https://support.apple.com/en-gb/guide/deployment/depf4ab94ef...
https://en.wikipedia.org/wiki/Palm_OS
Perhaps focussing on productivity and helping users like these devices did/had to instead of being consumption devices is a way to explore?
As a bonus, if you're a parent and have kids it'll be very useful for them.
Shout out to TechLockdown (not my company) for making this sort of setup much easier to accomplish.
It takes a similar approach to the OP - changing restrictions requires a USB cable and a computer.
Also there is limitphone[3], but it has less settings and is easier to uninstall than andoff, but works via the same mechanism.
1: https://docs.andoff.one/ 2: https://www.teqtic.com/lock-me-out 3: https://limitphone.com/
* Remove Jelly browser with `adb shell pm uninstall --user 0 org.lineageos.jelly`
* Disable F-Droid so you can't install another browser on a whim with `adb shell pm disable-user org.fdroid.fdroid`