It’s a tangent but two points:

First, the reason LLMs learned to like em dashes is that they are common in the training corpus - they are a thing before LLMs that LLMs have learned, not invented?

Second, work browser has nice blue swiggles under everything I write into a textbox. I dutifully click through them and accept the rephrasing suggestions. I get a lot of em dashes. My blog posts and whitepapers and stuff are full of them and other “AI tells” - but I think they read better because of it.

I use emdashes all the time. They're correct punctuation as opposed to a minus sign. They're easy to type too: opt-shift-minus. If they were such a huge giveaway without ever being used by humans, models would be trained by now not to use them as much.

The blog is about AI. So yeah the TLD is .ai

I can't imagine why a system designed to reproduce the best writing styles would frequently use em dashes.