Interesting discussion and I think Steve Muench summarizes the issue nicely:
” Even though the source pixels may have come from my own image stock, and AI is following a set of criteria that I provide, the resulting image is a surprise….and so it is not really my creation. I don’t believe these should currently be eligible for any SRPS competition.”
In fact, I think that might be a good way to “draw the line.” If you are surprised by the result, it is probably not your creation.