Em dashes are useful and necessary punctuation.
Typography
Type design, setting, fonts, etc.
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Em dashes in internet prose are more redundant than not, imo.
However, the AI clues I use are beyond just the presence of em-dashes, AI seems to use them in a predictable style (in the final part of their answer). They also use emojis section headers and bolding excessively.
Em dashes are useful and necessary punctuation.
Also you have to go pretty far out of your way to use one on a computer...
I just like anything that lets me have asides but brackets () work just as well
Honestly to me it's usually the excessive emoji use.