Also I don't know from where you assume that an "average teen" can easily crack a manufacturer-imposed lock.
Who is the "average teen" that can take an IPhone and bypass FaceID or the Pin Lockscreen ? Which average teen can bypass a password protected secure-boot UEFI bootloader ? Which average teen finds an exploit to unlock a phone bootloader without the manufacturer key ?
If the a law would force the manufacturer to take it seriously, they could make the parental control far harder to bypass than this ridiculous and privacy invasive law
You only need one cracker. Friend-groups usually have someone patient enough to follow "tech recipes". - ingredients/parts - sequential process - result
If Apple cares enough about locking something, no average person bypasses it easily