For me cyberpunk is defined not simply by its aesthetic, but by its exploration of the thesis "anything that can be done to a rat can also be done to a human being". A cyberpunk novel is a (usually cautionary, of course) tale of what happens when you strip away outmoded humanistic notions of dignity and agency and replace them with something weird.

In relation to this I'd like to mention Strugatsky brothers' book Predatory Things of Our Times (translated into English as The Final Circle of Paradise, wikipedia link: https://en.wikipedia.org/wiki/The_Final_Circle_of_Paradise). It is their lesser known work, but IMO it is first-grade cyberpunk. The rat-human stuff is there all right, but also a very believable near-future setting with a post-capitalist society that is outwardly prosperous but rotting inside. The remarkable thing is that this book feels very modern but it was published in 1965 in the Soviet Union.