And, as someone also pointed out in that thread, being on Hackernews and having IP logging may be enough to trigger that requirement.
Further, with the absolute shitshow that is the US court system, if someone brings a frivolous suit you're looking at thousands of dollars in legal fees, because you're going to need a lawyer (or previous experience in law) to properly explain to the judge why this suit is utterly ridiculous. And there's no guarantee if you'll get compensated for that, even if you file counter-suit--and even if you do get compensation, it's likely going to happen several years later, after the guy who tried to sue you does everything in his power to avoid paying up, because he knows you're eventually going to run out of money.