Em dashes are used often by LLMs, because humans use them often. On mac keyboards its easily typed. I know this is oversimplifying the situation, but I don't see the usefulness of the constant witch-hunting for allegedly LLM-generated text. For text we are long beyond the point, where we can differenciate between human generated and machine generated. We're even at the point, where it gets somewhat hard to identify machine generated audio and visuals.