I'm a Rewind user and really enjoy the product, but this isn't quite true. Again, maybe this has changed since the beta, but the "Ask Rewind" page has the relevant info[1]:
> No audio, image, or video files ever leave your machine. Ask Rewind only sends relevant text-based data to the cloud, excluding personal sensitive information such as credit card and Social Security numbers.
> When you ask a question, only the text of the most relevant moments from your past are sent to GPT-4 to generate an answer.