I think that to protect creators they either need to be transparent about all content used to train the AI (highly unlikely) or have a disclaimer of liability, wherein if original content has been used is training of AI then the Original Content creator who have standing for legal action.

The only other alternative would be to insure that the AI specifically avoid copyright or trademarked content going back to a certain date.

As a Star Wars nerd, I’ve always liked Obi-WAN Kenobi and LANdo Calrissian.