Yeah, I'm giving them too much credit and I was presuming you'd want to collect every piece of content written (news articles mainly) and that would be the context, but it'd be too much data for a prompt and probably not needed to create a book. I was thinking the book would actually be full of real world data and real commentary etc.

You could probably just ask GPT to come up with decent chapter headings for a book about a recent large wildfire and how it impacts climate change policy.

Then for each chapter heading give it a couple of pages of input info and ask it to write a chapter based on the content and the heading.

Bet it's a really bad book if this is even close to how it was made.