I was recently asked to review a book - and it rapidly became clear that it was AI generated. The em dashes were a clue not just because they existed, but how they were used. Which is to say, poorly. Egregiously and dare I say, juicelessly.
But even without them, the text had no juice.
People posting about how they’ve never seen em dashes used before the rise of ChatGPT are really great at telling folks they’ve never read a book before.