Cyberpunk is not just about the aesthetic of tall towers, foggy cities and futuristic neon signs and cybernetics.
Cyberpunk is a massive and diverse genre with a history that goes back to the 50's and 60's when science fiction writers started writing dystopian sci-fi as an antithesis of the generally utopian visions of the future popular in the 1940s and 1950s

Cyberpunk is simply "Low life, High Technology". 
Cyberpunk doesn't have to be the entire theme of a sci-fi universe it can also be substories or sidestories of otherwise non-cyberpunk science-fiction universes. Cyberpunk can be broken down into multiple derivatives and even geographical interpretations. 
In a lot of ways Cyberpunk is no longer the future, it's now. 

>Western Cyberpunk: 
Roots in New Wave science fiction literature. Tend to use elements from crime fiction. Postmodernist prose to describe an often nihilistic underground side of an electronic society. Sometimes pokes fun at and, to a certain extent, condemns utopian science fiction.
Blurring the line between actual and virtual reality. Old and new exist in confusing relationships. Complete destruction of social morals for capitalism/science/technology etc. 

>Eastern Cyberpunk: 
Roots in underground music culture, specifically the Japanese punk subculture that arose from the Japanese punk music scene in the 1970s.
Japanese Cyberpunk Cinema aka Extreme Japanese Cyberpunk Cinema: 
Characters going through monstrous, incomprehensible metamorphoses in an industrial setting. Experimental film genre; they often involve purely abstract or visual sequences that may or may not relate to the characters and plot and an incomprehensible narrative. Recurring themes include: mutation, technology, dehumanization, repression and sexual deviance
>Japanese Cyberpunk Anime and Manga:
Subgenre of manga and anime works with cyberpunk themes heavily influenced by Western Cyberpunk and in turn also heavily influencing Western Cyberpunk.