I can see why it's unfortunate but the idea posited that that it's somehow illegal in the US is ridiculous. You have no right to watch porn anonymously at the expense of holding porn companies liable for distributing porn to minors.
Internet 1.0 was largely read only, ephemeral, or decentralized. Chat rooms, IRC, personal webpages, etc. There was anonymity and there were not age restricted services.
Internet 2.0 introduced age restricted services and the enforcement lagged. The enforcement is now catching up. You can still do all the Internet 1.0 things anonymously but you can no longer gamble online as a 14 year old and hopefully soon you wont be able to watch porn either.