Earlier quoted context omitted.
What if the link had consisted of a prominent section "How to find it" consisting of the words (I'm making this up) "Search Google for leaked playboy pictures from 2011 , and click on the first link, which should be a site named after a fish." Now it is a passing reference to how to find it -- but your criteria that 1) they made money from it, and 2) they could know and should know that this content is illegal. Well,…
I don't think reproduction is a good line at all; HN could still be guilty if someone posted an unlicensed copyrighted work (say, a news article). Intention and knowledge is the best dividing line, in my opinion, and courts certainly take it into account. HN blindly reproduces what people post, whereas the link in question was posted by the site editors themselves - that's a clear distinction, and in fact many lawsui…
There are 100's of these on HN already.
Just a few samples: