I hate myself for saying it, because of all of the buzz/hype, but LLMs can assist here.

You get better intent assessment than with NLP/ regex/whatever.

Plus HN is entirely in English, so you never have to worry about lexical resource gaps.

There is no off the shelf solution - afaik. In addition I have no idea how expensive running costs will be.

But something serviceable can be built.

Source: mod /t&s person dealing with these things

Even a bad implementation isn’t going to be showing this warning to people often enough to desensitise them. And if they make a habit of ignoring the warning to post flamewar stuff… that’s solved with moderation by a human. The intent is to add friction for knee-jerk low-quality comments, not solve for people who persistently, intentionally post low-quality comments after a warning.