[yborg]

It helps them by making it somebody else's responsibility to get it right and thus shields them from liability.

[Frieren]

The OS should start labeling everybody as a child by default. Forbid Facebook to show ads and any harming content by default. The OS has little less to lose with this approach than FB.

[progval]

So it lets them know for sure who is a child. What liability does that shield them from, and how?

[ben_w]

FB etc. may argue "device says this user is an adult", even though device may say that only because the parents don't set up separate user accounts e.g. shared family iPad, or because the kids being more tech savvy in the first place like we all were when I myself was a kid.