Your name and email are never sent
Prompts carry book details and aggregate facts about a collection, not who owns it.
Two companies process it
Anthropic (Claude) and OpenAI (GPT). Both are used; OpenAI handles more of it than Claude does.
Most of it waits for you to ask
Cover scanning, credit lookups, descriptions and recommendations all start with something you do. Saving a book also sends its details to be read for themes, which is what makes recommendations work.
AI never decides what a book is worth
Values come from your grade, signatures and condition against pricing rules, with no model involved.