I get the impression ATM that copyright infringement is legal as long as nobody complains. When one person complains or files a DMCA takedown notice, no problem, it gets taken down. It needs to be a big company's documents - like Elsevier or (in the Bittorrent era) music publishers - before a major legal action is undertaken to take a site offline.
TL;DR it's not a crime if nobody complains. Now that someone complained though, things might end up badly for the owner.
TL;DR it's not a crime if nobody complains. Now that someone complained though, things might end up badly for the owner.