Good point, but judge's reduction it to a book equivalence is misleading and weakens the judgement.
Porn may provide a suitable model: not all movies need age verification, so those can be viewed at any age. Some movies, however, do require age verification. Similar age ratings could be applied to apps. For example, Facebook only after 18 regardless of parent's approval.
Porn has always been treated differently than other speech that is why most age verification laws want for it first. As for your other examples those are all technically voluntary, as it’s unlikely a government mandate that nobody under 17 can watch an R rated movie would pass constitutional muster. Parents can restrict what speech their kids say or hear but the government generally cannot in the US.
> Parents can restrict what speech their kids say or hear but the government generally cannot in the US.
Good in theory, but practically impossible. Peer pressure is too high for parents to be a significant barrier. If you were successful, please share how you did that.
"Cannot" in the US means no route to enforcement in that context. Distribution of NC-17 content to minors was never directly illegal, but doing so anyway would open the door for potential legal issues under the more broad umbrella of laws that cover "distribution of lewd or obscene content to a minor" which is more of a "do so and find out" concept of enforcement versus specifically identifying NC-17/X content by law.
> judge's reduction it to a book equivalence is misleading and weakens the judgement
Good thing that isn't what happened. It is called an "analogy" and is not a factual statement of equivalence.