Ethics aside - if anyone thinks chatGPT didn’t walk through the legality of there moves beforehand and their procedures they followed (which I'm sure are documented) I would be shocked. They are moving fast but id be certain that they knew they had relatively good legal footing. Johansson is rightfully taking them to court - likely this is all maneuvering for a settlement.
Either way this brings up artists rights in an AI world which is a good thing.