An update to Google's privacy policy suggests that the entire public internet is fair game for it's AI projects. If Google can read your words, assume they belong to the company now, and expect that they’re nesting somewhere in the bowels of a chatbot.
they also creepily retain any backspacing of your messages while drafting and analyze that too.
If you are an Android user try OpenBoard, it basically Gboard, just without the Google trackers.