alt Hacker NewsJudges are struggling to find the analogies known to them from the world of 70's. Apps are not like books only. They are like movies, sports, tools, postal mailbox, pet, friend, bank, money, shop, cab and anything you can imagine. When movies require age-restriction, apps can do so too.
And which movies, when broadcast on TV (i.e. viewed inside people's homes), verify the age of everyone watching before continuing? Your analogy is just as flawed.