I also want to comment on this idea - it sounds like an “upstream copyleft” clause, that would apply in cases where a given system is rebuilt using different data. I think that it’s conceptually interesting, but such a mechanism could not rely on traditional copyleft frameworks - Open Future has commissioned a study that shows general challenges with copyleft in the space of AI development: The Impact of Share Alike/CopyLeft Licensing on Generative AI – Open Future
(I hope that I am understanding correctly your idea)