IMO the use case for ChatGPT is stuff that's not important but still tedious to write. For example, I'm applying for engineering work and my resumé "looks" like shit, so I'm going to need to write a shitload of cover letters. I don't want to write them, like literally at all. It's boring and stupid. But ChatGPT will happily write them. Sure there might be factual errors, but I'll read the output and correct errors by hand. I still save time not having to write boilerplate or structure sentences.

Also, ChatGPT can work with programming languages. For example, I had ChatGPT write me a matrix algebra class in C++ just for fun. The first iteration didn't compile, but it had the jist of how to represent a matrix and matrix multiplication. The second iteration compiled and worked on what I tried it on. Would I use it in production? Probably not while Boost exists. However, I probably could have used it to start writing a matrix algebra library if I really wanted to.

The fact that people are asking it questions and believing it is just so plain stupid.

The fact of the matter is that people are more gullible than they think. People have been encouraged to blindly trust authority figures since the dawn of civilization. We are simply reaping the consequences of our continued complacency.

It's not unreasonable to ask ChatGPT (or anyone/thing) else questions. The issue is when they are treated as all-seeing oracles. ChatGPT in particular makes for a poor search engine because it is particularly likely to output convincing-sounding lies, because it is designed to optimize the convincing-sounding-ness of outputted text.

And if i need to do research to be able if it just talks bullshit again - why bother asking it in the first place?

Well, it can point you in a direction to begin your own research. However, the main use case is really when you don't want to do the work and you don't care about the quality of the work. I don't think people fully realize that workers generally don't want to do their work (would you do your job for free?), because that would contradict the assumption that work under capitalism is natural, voluntary, and not imposed upon the world.