I've posted a few "fake XYZ written by AI" on reddit over the years, and the model that got the best reactions was GPT-2. Markov chains aren't good enough to make something that is interesting for more than a sentence or two, and GPT-3 onwards is too clean and boring. GPT-2 is the perfect middle ground that can get grammar largely correct and maintain a cohesive idea, but doesn't yet know enough of the specifics of various topics to make things that make sense in the context of that topic.