Bitcoin is based on a peer-to-peer network of computers running the software. These computers are called nodes. Participants in the network might be running nodes for different reasons: for profit as in the case of miners, to manage full-node wallets, to collect and study information about the network, or simply as a social good.
Bitcoins decentralized nature contrasts to the structure of fiat currencies. Central banks make monetary decisions after evaluating evidence gathered from the evolution of the economy. In a decentralized system such as Bitcoin, discretionary decisions are not possible.
Understanding
Bitcoin
Cryptography, engineering, and economics
PEDRO FRANCO
My comment: yes, whatever you will think of Bitcoin is decentralized. Go back to your fiat money if you don't like it.