edit: my non-curly quotes got modified when I posted. Maybe it’s not such a great rule-of-thumb after all.
Someone noticed that Jack Dorsey (seemingly) used AI to write a message announcing the firing of his employees:
They noticed it because AI tends to use non-curly apostrophes and quotes (e.g., I’m vs I’m and “quote” vs “quote”). They noticed that most of Dorsey’s message used non-curly apostrophes except for one part which he must’ve edited or inserted/written himself.
Incidentally, I also noticed that AI uses non-curly apostrophes and quotes myself*, but it never occurred to me to use it an indication that something might be written by AI.
* At least the AIs that I use. And I haven’t checked if AI does it all the time or just sometimes.