Separate category for AI is a good start

A separate category for AI is a good start along with encouraging/boosting stats and viewability for those that post progress shots for human created stuff. Though they can be ugly, perhaps Artstation could add some type of NoAI watermark to existing and uploaded artworks so that if the images get scraped the watermarks might show in the generated outputs. Not sure how this can be done without compromising image quality too much but I'm sure it can be possible. Giving users the option to have the watermark added or not could be good too.