A Taxonomy of Moats (reactionwheel.net)

Was disappointed to find out this is about economic moats vs physical ones

I was looking forward to discussions of round-vs-angular, filled-with-water, containing hazards, etc around forts and castles

Given that this is a Y Combinator site, and frequented by startup enthusiasts, I am confused and concerned about the lack of interest in this article. This is exactly the kind of thing that young entrepreneurs need to read.