The default for most AI writing tools is permissive: prompt and completion are retained for a window, often used to improve future models, sometimes shared with third-party providers. Read the privacy policies of the popular ones — the language is typically “may use submitted content to improve our services.”
For published authors, novelists under contract, or writers working with sensitive material, this is a real concern. Once your unpublished work is on someone else's server, it's on someone else's server.
PlotForge's position: the cloud option is privacy-first by enterprise terms; the desktop option is privacy-by-architecture. You shouldn't have to trust us — you should be able to verify.