My experience is exactly the book reproduction part when I used a LLM to help with a narcissist. I had no choice but to deal with them, for months. I was stressed and panicking from fending off constant attacks while undoing years of conditioning and abuse, raising two young kids, working, seeing a therapist, seeing a lawyer, and cramming self-help and communication books.

My lawyer suggested it. It picked the manipulation hidden in ‘reasonable’ requests and phrased things safely for me while I learned to do it myself. It did a good job, still better than I do. I was reading a few self help books and began noticing familiar phrases. It was reproducing sentences, sometimes closely paraphrased, sometimes verbatim. Like, a lot.

I feel a little bad because I probably used a bunch of water, but I got full custody. They had been doing a great job making me look like the crazy one until they started flipping out from me being calm and professional in response to their abuse instead of panicking and flipping out myself or shutting down. Sorry planet, thanks for the water, will do better next time.