Safari is not included in 'Downtime' on my MacBook Pro

setting up my kids Macs,

safari is excluded from 'downtime' ? why ?

yes there are app time limits, but that won't stop my kid jumping on at 8pm and doomscrolling YouTube for 8hours (if that's what you set the time amount for).

Am I missing something here ?

[Re-Titled by Moderator]

Original Title: Mac - Downtime - Safari not included ???