Setting aside ad-driven revenue - the ideas, when spat out by an llm, are disconnected from the author. If people like your ideas, they aren’t becoming fans/followers/long-term-readers. That means good luck leveraging some interesting writing into a book, a speaking tour, a podcast, or even any kind of consistent readership. The llm slurps up your content and monetizes it while you get nothing.

I'm not interested in a book, speaking tour, or podcast. I've never had consistent readership because I write about too many unrelated things. I blog because I have ideas I want to share; I don't feel at all ripped off.