With me, it has been story/novel ideas. The AI is a genuinely useful tool for brainstorming through ideas and giving historical and scientific background. I don’t let it write the stories, but I throw ideas at it and it riffs on the ideas which gives me new ideas and so on. Useful, but you realize it’s 4AM and you’re obsessively plot outlining a trilogy and sketching out characters and inventing a new economy when you connected to ask a personal finance question.

I’ve found it useful, but I recommend a “give me an honest critical evaluation as if you were an editor/agent/publisher” and “Is this derivative of anything?”