This and VertexMachine’s comment are a fair interpretation and make sense. So copyright is questionable, (and probably not granted at this time) but IP rights are if provided in the generator’s TOS.
So, the question remains, what if someone steals your imagery? If the AI generator can create an identical image, then even having a receipt from a content provider here in the marketplace might be moot. When questioned, the content thief could claim that they generated the content themselves via the AI tool.
It might be a clear-cut case if the developer altered the images. In such a case, the developer leaves their own creative ‘stamp’ on the images, thus the thief can’t claim it as their own IP.