A decent way to classify human vs bot when it comes to dashes, is that all bots use ‘em-dashes(—), while almost none use regular dashes (-) in writing. While plenty of humans will use regular dashes, because they won’t bother to look for ‘em-dashes on the keyboard, or phone.
Of course, you have the people that correctly use em-dashes, too.
Of course, you have the people that correctly use em-dashes, too.