> I haven't seen any of those apps (or built-in OS features like screen time on iOS) not become useless in a matter of days.

This isn't consistent with the data. I'm a cofounder of Clearspace and we see that when people make it through the first two weeks, they stick around for months or years.

YMMV - because our feature set looks slightly different - half users are in a mode where you have to do pushups to unlock distracting apps which really does tend to stick for people that opt in. (like this https://x.com/_oliver_hill/status/1825605422885253445)