Parents can do this today if they wanted to

The problem of "kids accessing the Internet" is a purposeful distraction from the intent of these laws, which is population-level surveillance and Verified Ad Impressions.

Today, in practice it's not a choice, because even the most attentive parents fail to block internet access. Parental controls are ineffective, and all the kid's friends have access so they become alienated. https://beasthacker.com/til/parental-controls-arent-for-pare...

But laws alone won't fix this, and laws aren't necessary (except maybe a law that prevents kids from buying phones). In the article, the child's devices had parental controls, but they were ineffective. There's demand for a phone with better parental controls, so it will come, and more parents are denying access, so their kids will become less alienated.