It's trash as an idea generator.

The only useful thing I've gotten out of a (text) AI is asking it to guess functions of keyword mechanics in games. Like I was designing personality traits for AI leaders in a strategy game, and had a dozen bad candidates for "over produces defenses." So I told ChatGPT to try to guess the meanings of bunkerist, hoxhaist, prepper, turtle, protectionist, survivalist, isolationist, guardian. Which did narrow it down to bunkerist, turtle, and protectionist (note that this is literally wrong in the case of protectionist). Normally I'd try to poll a bunch of random people for this sort of thing, and try to avoid anyone who's trying to be clever. So it did save some work there.

It won't come up with anything useful going the other way around though ("list some possible names for traits of AI leaders in a strategy game"). Like I said, it doesn't work as an idea generator.

I guess in general it's probably useful if you're in a situation where you need to make sure your writing is very very clear. If ChatGPT can correctly summarize what you wrote, it's probably safe for people who are distracted or bad at reading or whatever.