Incidentally, I first learned about Stylometry when reading about people using it to decipher the identity of Satoshi Nakamoto, so I'm happy you brought it up. I had my suspicions that bot farms for Reddit (even before 2019) were doing something similar to this to generate massive amounts of fake account activity to make subreddits appear popular. Now it seems like a piece of cake to do this with things like GPT-3.