They are grammatically correct but logically nonsense. The examples shown are also curated from thousands of generated text.
The only use for these is the seo landfill to get in top of Google
I do have ideas for more practical content generation but those do not currently have plans to be made public.
In part because we're trying to probe what it even means to "understand" something. If an AI is capable of carrying on a cogent conversation with you, does it understand what it's saying? How do you know?
It is slightly better now than it used to be, i.e. you now have to read two sentences to realize it's incoherent gibberish, rather than just one. But thinking you're getting closer to understanding this way is like the metaphor of climbing a tree to reach the moon: you can keep reporting progress until you run out of tree.
As for it being entertaining, sure, the first attempts were entertaining and instructive. Now, years later, reading more gibberish from a neural net on HN, not so much.