Unauthorized training data isn’t an existential threat to generative AI but it’s certainly a headache for users and developers alike.  Most developers are trying to exclude materials that creators have explicitly labeled as unauthorized and citing “fair use” as justification for copying everything else.  Getty Images has taken an opposite approach, building its gen AI tool only on materials that are explicitly licensed.  It’s possible that tracing the provenance of training data will become a standard, similar to how organic food producers trace the origins of their ingredients.