Yes this is absolutely correct. I can think of more content that's disallowed on HN than content that's allowed: no politics (for the most part), no flamewars/aggressiveness/name-calling, no self-promoting links to your OnlyFans, nothing hugely offtopic, etc. And that's on top of very aggressive moderation of things other social media sites are filled with but are de facto banned here: shitty puns or jokes, one-line zingers, meaningless affirmation comments like "So much this" or "This is the way", nitpicks about submitted articles or personal swipes at the authors' politics...

HN has incredibly strict moderation, and to be clear, that's a good thing. It keeps discussion in line and useful, for the most part.

> It's funny, the same exact people on here who insist they can't ride the bus or walk around cities because they freak out if a homeless person accosts them seem to be blind to the concept of how other people's free expression can have a chilling effect.

I've seen that the term "gatekeeping" is recently starting to be reclaimed as people realize this, to emphasize that while anyone is welcome to participate, the community is not required to bend its rules or standards to accommodate new people. i.e. anyone is welcome to use the bus, but openly shooting heroin while you're on it won't be tolerated.