The US Copyright office says you can't copyright Midjourney AI-generated images, The Verge, Feb 22, 2023

A reproduction of the cover page and the second page of Zarya of the Dawn, from the US Copyright Office’s letter. Image: Zarya of the Dawn — Kris Kashtanova / Midjourney

A comic book that had been granted copyright protection has seen it partially rescinded by the US Copyright Office, citing that while the text and its “selection, coordination, and arrangement” with the comic book’s images were the artist’s products, the images themselves were not (They were produced Midjourney).
Read the article by Richard Lawler here: The US Copyright Office says you can’t copyright Midjourney AI-generated images - The Verge