I’m new to the genre, I’ve only seen such things as Neuromancer’s world, Ghost In The Shell’s world, Bladerunner’s world, Snow Crash’s world, Cyberpunk (Tabletop and 2077)’s world, The Matrix’s world, Terminator’s world, Next Gen’s world, Star Wars’ world (coruscant), Nobody Wants To Die’s world, Marvel 2099’s world, and Altered Carbon’s world.
In terms of absolute dystopia, I personally believe Coruscant from Star Wars is the most extreme cyberpunk we haven’t seen enough of.
Coruscant used to be a planet like our own, mountains, oceans, and trees. For thousands and thousands of years the development of technology and architecture has grown so far to the point that the highest level of city grounds on coruscant are way above atmospheric level. A mountain as large as Mount Everest is reduced to a mere observatory in a museum with only its peak visible. It is the most extreme and literal concept of cyberpunk I’ve seen thus far, with an underworld literally being under what we usually see. The rich live on the top floor of the city, whilst those whom are ignored, dehumanized and suffering from severe crime rates live underneath in a corporate plagued underworld with high and extreme surveillance. The lower you go, the worse it gets. People die down below just from working with extremely old machines and (someone can correct me if I’m wrong) rogue and abandoned AI.
I have photos of Coruscant attached, just looking at the near-surface underworld alone is terrifying. It’s an over-the-top dystopia.