My instinctive first response: "I'd just tell them, that's what I've been doing with most of my students"... but then I realize the students part here is important; I've not been able to critique my PI last time when I noticed he gave my AI-slop feedback on a draft I sent him. So, even though I like to believe I am very straightforward when it comes to scientific discussions, there's still some hierarchical reverence dictating my actions when push comes to shove. But right after that, another colleague reminded said PI that she does not want him to put unpublished work into a proprietary LLM. She is much less direct than me, usually, so I was pleasantly surprised.