This is the kind of deep investigation of a super specific issue I always enjoy reading. This is what I thought the internet would be, 20 years ago.
It's a sign of a "cognitive surplus", because we have more educated people now than we have jobs for them to do. Also it's a sign of how these sites get people to work for them for free, and concentrate huge amounts of other people's work for their own benefit. This poster got nothing for all that work, but SE still gets advertising revenue driven by interest in the content.
@sp332, you've submitted 693 items to HN, and you've made thousands of comments.
What did you get for all that work?