> I wonder if Google's noticeably worsening search quality [...] commercial spam has taken over much of the results. On the contrary, I believe the systematic

> I wonder if Google's noticeably worsening search quality [...] commercial spam has taken over much of the results. On the contrary, I believe the systematic effort from commercial spams is also responsible for degrading the SNR for everyone. A common tactic is pretending that you have the files. For example, you can enumerate all the books from a directory and create a single page for every book that claims you have them or tries selling them, while all you get is unwanted software. You can ever create PDF spams, so that even if you filter "filetype .pdf", you'll still see them. Meanwhile, all the genuine files are being taken down.