The US Copyright Office has reconsidered the copyright protection it granted last fall to Kristina Kashtanova for her comic book Zarya of the Dawn. It featured pictures created by feeding text prompts to Midjourney, an artificial intelligence image generator. The Copyright Office says it only became aware the images were produced by Midjourney after the registration was granted, based on social media posts by Kashtanova.
Source: The US Copyright Office says you can’t copyright Midjourney AI-generated images