To be honest I had the same thought 10-15 years ago when I was reading stories to my daughter. It was all written after a template, changing names of places, characters and goals for the story. Many were based on Harry Potter with kids going to magic schools and saving the world. Even a series of them with exactly the same story in each book, just a new goal for each book. The series covered half a shelf at the local library. Daughter quickly got tired of them and we started reading Terry Pratchett instead.
There's a huge industry of ghostwriting bad children's books based on what's popular. Zoe Bee did a great video on her experience writing unlicensed Minecraft stories[0].
But the point is that these are basically paying humans to churn out low-quality cookie cutter stories in a time frame and compensation rate that hardly permits for any real creativity. This is an obvious example for something GPT can do well, but that's just automating garbage production.
Automating Terry Pratchett on the other hand is impossible without "genuine" creativity: his stories work not just because of the technicalities (a fleshed-out world with consistent rules and characters) but also because he had "something to say". He had personal and political views, experiences and opinions that influenced his work and world building.
In essence, works like OP's and the similar ones others have linked here remind me of Hayao Miyazaki's infamous reaction to machine learning driven animation[1]: it's an insult to life itself. It's a soulless approximation of the trappings of art that doesn't understand what it supposedly attempts to capture and can say nothing about it because it doesn't have an opinion on it.
