A write-up documenting Gemini's data handling topped Hacker News this week, and its core evidence is Google's own wording. Google's Connected Apps help page says "a subset of Connected Apps data processed by Gemini is reviewed by human reviewers (including trained service providers)" — the summaries, excerpts and inferences Gemini draws from your emails and files, and, in Google's words, when an email or file is short or especially relevant "the summary may just be the email or file."

That is a quiet reversal of the promise Google made in September 2023, when it first let its chatbot read Gmail, Docs and Drive: that content "is not seen by human reviewers." The 2023 post still says that, but now carries an October 16, 2026 note qualifying it for newer features. Google's privacy hub adds that reviewed chats are kept for up to three years, disconnected from the account, and are not removed when a user deletes their Gemini activity.

The contractor-review clause applies to personal Google accounts using Connected Apps and Personal Intelligence; work and school Workspace accounts are treated differently, with Google saying their content is not human reviewed or used for training outside their domain without permission. The practical takeaway for personal users: if you do not want a reviewer to potentially see it, disconnect Gmail and Drive in Gemini's settings — Google's own page ends with that warning.