ChatGPT is pretty easy to spot (in some circumstances). Just look for text that has absolutely no voice and reads like a high school essay where what should be a 20-word answer is stretched out to meet a 750 word count. Example: https://www.quora.com/What-is-the-maximum-data-capacity-for-...
That's just the default style. Try a request "...in the style of marvin the paranoid android" or "talkie toaster from red dwarf" or"Ernest Hemingway" or "Donald Trump" for a bit of variety.
How well does it do with anything that's not just a pastiche? It's easy to throw in the tics of somebody famous, but can it actually do what a real writer does: focus on what's interesting, build a flowing narrative, target the material to the audience?
Exaggerated voices might give you variety, but I don't actually want to read a piece on the style of any of those voices. I would, however, be intrigued if it could write like me, or like any of the famous nonfiction writers who I've consciously patterned my style after (Isaac Asimov, Mary Roach, Cecil Adams, Michael Pollan)?