I think this is explained on the linked project page: This project isn't trying to be your best chat bot. I'd like you to enjoy a weird mix of nostalgia for 19

I think this is explained on the linked project page: This project isn't trying to be your best chat bot. I'd like you to enjoy a weird mix of nostalgia for 1990s technology paired with one the most magical technologies we can run on our computers in 2025. You might be looking for the more minimalist Grumpy which is hand-hewn from a pure silicon monocrystal.