You also accumulate screen time if you are using navigation while commuting, etc. I easily rack up 2 hours daily just from driving to my workplace and back home, so there are definitely some "passive" ways to increase those numbers.

I think focusing on numerical stats here is also a bit of a problem and while making these guardrails might help some people but the main issue should be addressed (overconsumption/addiction).

I wonder by reducing the screen time of the phone, how the screen time of the other devices (computer/tv/etc) changed.