If you're playing around with Google ~~Bard~~ #Gemini, you may want to hit up https://myactivity.google.com/product/bard and opt-out of it saving your conversation history.

By default, it'll hold on to everything you say for up to 3 years for possible review by humans.

https://support.google.com/gemini/answer/13594961

"Please don’t enter confidential information in your conversations or any data you wouldn’t want a reviewer to see or Google to use to improve our products, services, and machine-learning technologies."