Gemini ‘messaged’ me in google messages introducing itself a couple months ago. Just appeared like a normal text conversation with any other contact, but as soon as you click on it you’re presented with a wall of T&Cs.

Deleted the ‘conversation’ and it’s stayed gone; though there’s an option for it in settings.

The only other place I’ve see it is an on-screen reminder every time I use Google Assistant. (usually just triggering home automatons)