Sorry for the very long answer.
TL;DR: I claim that blockchains are topologically decentralized. But who cares? If you want to talk about them, why don't you tell what you think of them?
I think that the word "topological" is confusing. The way I understand this word in this context is that we are talking about how things are positioned in space but we are abstracting the distance between them to focus on the general way stuff are organized and connected. (1/6)