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Well, (some) people on HN definitely used them before ChatGPT. https://www.gally.net/miscellaneous/hn-em-dash-user-leaderboard.html https://www.gally.net/miscel

• wink 10mo ago
  Unfortunately this table doesn't show us where the em-dash users are coming from and if they are native speakers. It's not that it doesn't exist in my native language, but I don't remember seeing them very often outside of print books, and I even know a couple typo nerds. Maybe I'm totally off, and maybe it's the same as double spacing after a '.'. I had not heard of this until I was ~30 and then saw some Americans writing about it.