There are no stories written entirely by the "AI."
The vast majority of the stories people claim to be "written by AI" are in fact written conventionally, by the actual, living person, just in the distinct language, and then machine-translated to English where the implicit meaning behind some Eastern Asian language was lost in the mechanical transcriptions word for word. It feels off, but it isn't "AI", it just replaces words from one language with words from another.
The "AI", or "large language models" have one thing in common - they generate words, but don't understand the subject, meaning or content, only generate the most probable combination of letters without concern how is that going to be interpreted.
As such, "AI generated" content couldn't be longer than a few hundred words at best, as the "AI" (not being AI) doesn't understand what it is speaking about, and completely loses the point.
Such a story won't last long.
A machine translation, however, would. Because even the amateur writer with no skill understands the meaning of his or her story, it just sounds weird if the non-English speaking author wrote something in his native language, and the machine chewed it. In this case, storyline is preserved, it's just weird.
I've seen the AI generated chapters in the otherwise human written stories, and they lost the thread of its own story in the few paragraphs, something the human wouldn't do. This was professionally published, and I didn't doubt that the first chapters, or even 2/3 of the book, were genuinely human made, so I assume the author ran into deadline and wasn't able to finish the story in time, so it started to supplement it with "AI", but "AI" not being the author didn't know and couldn't know what was written before.
This generally doesn't happen on the Scribble Hub.
I looked on the supposedly "AI generated" story here, and that one comes in short, simple sentences, which indicate it was either inexperienced writer, was attempting to mimic the light novel simple sentence structure with one sentence paragraphs, or the entire work is a translation.