[SinePost]

What advantages does this offer over something like typing "$QUERY -site:*.com" into a mainstream search engine? I think webmasters in general do a pretty good job at self-segregating their sites into commercial and non-commercial entities through the use of different top-level domains.

[1123581321]

The advantage is a better set of sites since there are a ton of interesting little .com sites out there, and lots of unwanted sites on .org and country code domains. He also blocks some URL patterns that appear on spammy domains regardless of TLD. Try a few searches or the random results page to see the difference. It’s fun browsing.