[dragonwriter]

> So if you delete your image the entire trained data set is invalid because they no longer have license to the copyright?

The portion of the training set might. The actual trained result -- the outcome of a use under the license -- would, at least arguably, not.

Of course, that's also before the whole "training is fair use and doesn't require a license" issue is considered, which if it is correct renders the entire issue moot -- in that case, using anything you have access to for training, irrespective of license, is fine.