I'm a manual writer. Can I use ChatGPT on the cover of my manual?

I would definitely ask here…

https://chat.openai.com/

It should be okay as a book title if you’re not pretending to be OpenAI, but I’d rather be safe than sorry if I were you.

I wouldn’t trust the output 100%, but you might have ChatGPT summarize the ToS, etc…

Good luck.