I first thought that if Getty were to sue anyone, it would be those actually publishing and distributing works derived from copyright material (i.e. end users)

I first thought that if Getty were to sue anyone, it would be those actually publishing and distributing works derived from copyright material (i.e. end users) rather than the providers of mere tools. But I wonder if they could make the argument that the ML model itself is a "derivative work" (I don't agree that it is, but I can see the case being made). That would be a heck of a court case and resurface a lot of the "illegal number" (https://en.wikipedia.org/wiki/Illegal_number https://en.wikipedia.org/wiki/Illegal_number) stuff again.