If you take a model trained on Getty and ask it for Indiana Jones or Harry Potter, what does it give you? These things are popular enough that it's likely to be present in any large set of training data, either erroneously or because some specific works incorporated them in a way that was licensed or fair use for those particular works even if it isn't in general.
And then when it conjures something like that by description rather than by name, how are you any better off than something trained from random social media? It's not like you get to make unlicensed AI India Jones derivatives just because Getty has a photo of Harrison Ford.
