Taking this further why aren't there more communities like HN? What makes this place so special and obnoxious at the same time?
I don't know if YC keep this site running purely out of love or if it's a calculated ploy to make money, but if HN is profitable for YC then it's in a very indirect and hard-to-quantify way - e.g. YC startups using HN as a recruitment platform. Dang doesn't have money-hungry VCs breathing down his neck telling him to maximize "engagement" - the day that happens will be the day HN devolves into an unreadable, unusable pile of garbage, like what happened to Reddit.
There aren't many communities like HN because there aren't many organizations that have the resources to run a site like this without running it into the ground because they have dollar signs in their eyes. The few that do exist are probably small forums focused on a super-niche topic or hobby, but if I knew of them I wouldn't post them here because I wouldn't want to spoil the secret.
If anything HN feels like it has a lighter touch with moderation than most other places online, and I have never seen them outright censor certain political views or show any sort of favoritism towards any one company or group. I think much of that comes from having a small, passionate community that can manage the task of behaving and debating in good faith.
If someone could figure out the method for crafting communities like HN for other interests... that person would be a treasure to the internet.
Forums are also still a thing, and many have thriving close-knit and heavily-moderated communities for people of a common field or interest.