ChatGPT writes a particular dialect of good writing. Always insisting on cliffhangers towards the summary, or "strong enumerations", like "the candidate turned out to be a bot. Using ChatGPT. Every. Single. Time." And so on.
I saw this described as LLMs writing "punched up" paragraphs, and every paragraph must be maximally impacting. Where a human would acknowledge some paragraphs are simply filler, a way to reach some point, to "default" LLMs every paragraph must have maximum effect, like a mic drop.