Gemini trains on personal chats unless you turn off Keep Activity

Google's Gemini privacy hub says that when Keep Activity is on, your saved chats are used to improve its services, including training generative AI models, and a subset are read by human reviewers. Reviewed chats are kept for up to three years, even if you later delete your activity. The ways out are turning Keep Activity off, which keeps chats for only 72 hours and makes some connected apps such as Google Workspace unavailable, or using temporary chats. A Hacker News post flagged that paying for a personal Google AI plan does not change this; the help page makes no exception for subscribers, while work and school accounts fall under separate Workspace terms. On Hacker News (623 points), the biggest reply thread is about Pixel phones, where tasks like reminders stop working with Keep Activity off. Most other busy replies say this is expected and assume every provider does it; one commenter argued the review and retention rules are mainly about liability, and the poster replied with the page's own wording on model improvement. No real dispute on the facts. Sorted take: treat a personal Gemini account like a shared notebook, and keep client or company data in a Workspace account or a temporary chat.