In the workshops I give about AI writing/detection I point out that the tech companies have a strong incentive to fix whatever the public doesn’t like about AI writing style. So any ‘hallmarks’ you learn to spot—which already aren’t reliable—will be obsolete within months. Save your energy, and more importantly save yourself from the very real risk of linguistic discrimination, and stop looking for AI hallmarks.
It’s true. Chat is now better at not using em dashes—if you instruct it via custom instructions. You can find your custom instructions under your personalization settings.