Comment by otakucode

The legal restrictions are not actually on Liam, or any user. They are on the site itself. The law in the US prevents the collection of any personal information from anyone under 13 years of age. Once you are 13 years old, you are a trackable, surveillable, profilable, saleable commodity. Prior to that, though, your personal info is protected from collection.

But... HN doesn't actually collect any personal info. So, that's likely either a reflex inclusion of such a clause or just an abundance of caution.