Conversations that have been reviewed or annotated by human reviewers (and related data like your language, device type, location info, or feedback) are not deleted when you delete your Gemini Apps activity because they are kept separately and are not connected to your Google Account. Instead, they are retained for up to three years.
Emphasis on "retained for up to three years" even if you delete it!!
If i'm not wrong, Chatgpt states clearly that they don't use user data anymore by default.
Also, maybe some services are doing "machine learning" training with user data, but it is the first time I see recent LLM service saying that you can feed your data to human reviewers at their will.
I believe this is out of date. There’s a very explicit opt in/out slider for permitting training on conversations that doesn’t seem to affect conversation history retention.
