Your concern is a good thing; copyright is an important issue and it's so easy for it to be violated. But I respectfully believe, in this case, your concern is misplaced.
My understanding is that Cheska Potter, the artist, had a profound change of spiritual beliefs and therefore wishes to distance herself from the Greenwood Tarot. I don't know any more than that, and for the sake of her privacy (which she appears to value quite highly) I personally will leave it at that. It is also my understanding that she has given permission for the artwork to be shared for personal use only, as discussed here in this thread and elsewhere on AT.
I do try to keep a close eye on this thread. If I am asked by Solandia, by the publisher, or by Cheska to take the files down, I will do so immediately. I'm sure Mi-shell would do the same with her files.
I hope that helps with your concerns.