I appreciate them being upfront with that, but for a paid feature, it sucks that they offer no privacy or opt-out mechanism.
> You can turn Gemini Apps Activity off If you don’t want future conversations reviewed or used to improve machine-learning models, turn off Gemini Apps Activity Opens in a new window .
I also asked Gemini (not Ultra) and it told me that there is no way to prevent human review.
The word "future" in what you quoted is doing a lot of heavy lifting.
My assumption is you have to give it access to all your data, which it then processes for before you can opt out of it.
The only exception might be if the agreement explicitly prohibits the provider from doing anything with your data or even viewing it without your permission, but that's rare.