Never heard anything about what you are talking about. There isn't a charge for using tropes, plot points, character designs, etc. from other people's works if they are sufficently changed.
If an LLM reads a free wikipedia article on Aladdin and adds a genie to it's story, what copyright law do you think has been broken?
Meta and Anthropic atleast fed the entire copyrighted books into the training. Not the wikipedia page, not a plot summary or some tropes, they fed the entire original book into training. They used atleast the entirety of LibGen which is a pirated dataset of books.