As others have pointed out, this is just a foot in the door. There's also a part of the law this article doesn't cover that requires EVERY application to query this information on every launch, regardless of whether or not the application has any age related limitations.

Keep in mind this forced parental control system in the OS is supposedly because of app stores.

So we're already pretty deep in the law deciding what shape of computing you're allowed to do. What makes you think it will stop here?

No but then the next step is "well we need a way to enforce it because people are just lying about their age".

I guess let me show a slope I found over here, just past the boiling frogs, watch your footing though, it's recently been greased and is quite steep.

Overton window.

Wedge.