The usefulness of ChatGPT for me is as a replacement for using Google when I have to learn something new (eg an API). Formerly, I would have Googled, and then visited a bunch of results, and learnt a little on each page until I had built up an answer for myself.
I see ChatGPT as a Google mashup. It takes those Google results, and mixes them up to give me a more direct answer to my question. Previously, my own brain would have to do that mashup.
I do exactly the same but for a subject that I don’t really know. I’m curious to know if Google’s traffic is affected by this change of behaviour.