Many (most?) WYSIWYG editors automatically convert two hyphens (--) to em dash, no need to specifically look out for it.
People aren't likely to pre-type their HN and reddit comments in a word processor though, so when you see them on such sites, it's a good indication that the comment came from an LLM and not a genuine person.
alt Hacker News
People aren't likely to pre-type their HN and reddit comments in a word processor though, so when you see them on such sites, it's a good indication that the comment came from an LLM and not a genuine person.