It's not centralized though. Each node is independently building and verifying the entire record, based on no criteria other than (a) prefer the longest chain and (b) use blocks you get over the P2P network from other nodes. You are using the word "centralized" incorrectly, or at the very least, in a way that is inconsistent with the way that everyone else in the space uses it. A semantic argument over a word doesn't change the way that things work.
The only centralized thing about Bitcoin is that the logic (i.e. the software rules) that all nodes are using is the same. If this weren't true then there could be no consensus blockchain. But there's a huge difference between thousands of different actors, all who merely happen to be running the same software that determines things by consensus, and then a single authoritative actor who controls everything by fiat.
The only centralized thing about Bitcoin is that the logic (i.e. the software rules) that all nodes are using is the same. If this weren't true then there could be no consensus blockchain. But there's a huge difference between thousands of different actors, all who merely happen to be running the same software that determines things by consensus, and then a single authoritative actor who controls everything by fiat.