I would say that art is in the eye of the beholder. :)

We do have similar conflicts of interest, even among humans. It is not at all unusual for "the time to be ripe" for some particular invention. There have been inventors (as one myself, I recognize invention as a high art) who have come up with the same conceptual breakthrough at about the same time. Both are original; who "owns" the idea?

In the case of duplicate writer AIs, I would be inclined to credit the AI software author. ;)