I already have this turned off. It's slow, but I use a browser extension to save my Gemini chats locally, when I want to keep them.
The concerns implied are that:
* You are automatically opted in, or you are nagged to opt-in in a manner that makes it easy to accidentally do so, as is not uncommon with these things.
* That the use of your data for training isn't just for you, it is also training any other models Google wishes to use it for.
* That once they have started, opting out does nothing: your data is already theirs. Not that wasn't already anyway, control of how your stuff is used is apparently a right reserved only for corporations.
Confidential compute is another option.
"Opt-in" is a lie when the user is harassed or tricked into "accepting".
Creepy and gross.
I expect that info to be completely sufficient to dox me; in the meantime, while waiting for the boys to arrive -- does anyone know how to make the camera in Waydroid not crash the entire stack? Or am I to understand that as yet another bloody rite of passage?