Google's NotebookLM uses your data to create an AI chatbot

What was previously shown off as Project Tailwind at Google I/O is now called NotebookLM. It's an "experimental product designed to use the power and promise of language models paired with your existing content to gain critical insights, faster". You add stuff to it from Google Docs and you can ask NotebookLM questions about the documents you've uploaded to it. Some examples Google provides are a YouTuber uploading "their ideas for new videos" asking NotebookLM to "generate a script for a short video on this topic" or an author working on a biography might upload their research and ask it to summarise interactions between certain people. Not sure which LLM it is using (probably Bard?) and it's not available for public use yet, but select users are getting access.