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We Asked A.I. to Create the Joker. It Generated a Copyrighted Image.
(www.nytimes.com)
This is a most excellent place for technology news and articles.
If you read further they also tested many other much more vague prompts, all of which gave intellectual properties they did not have the rights to. The Joaquin Phoenix image isn't any less illegal, either, though because they don't have the legal rights to profit off of that IP without permission or proper credit.