Why would it, if there are no copyright issues? No one is obligated to accept a license unless they require permission to do something which copyright would restrict. Of course redistributing the original image as part of a public dataset may be problematic, but simply using it to train an AI model—essentially the equivalent of studying it while teaching yourself to draw—is arguably not among the things covered by copyright, so you don't need a license for that and any clauses in such a license would be irrelevant.

This is also basically educational in nature, even if it's a machine rather than a human being "educated", and educational use is often exempt from copyright in some degree or another to begin with. If the dataset is restricted to non-commercial research and educational use in the right jurisdictions then even redistribution may not be an issue.