You people are so quick to correct me that you don't understand my argument: HPMOR is not niche in the world of fanfiction, and this doesn't require fanfiction to not be niche. You're also answering stats with anecdotes, so I think we are done here.

You didn't claim hpmor isn't niche in the fanfic community, you claimed it isn't niche on /the Internet/, and implied that basically anyone in a technical role would have heard of it. I'm sorry that you're upset to learn that very few people care about sophomoric LW thought experiments, but that's the reality of your existence.