Decentralized Exchange: This variety of exchanges stay true to Nakamotos ideology for cryptocurrencies. Hence, decentralized exchanges focus on protecting the anonymity of users and improving the security of the platform.
So what was Nakamoto's crypto ideology? There is nothing said about the anonymous transaction in bitcoin manifesto.
You should also mention that decentralized are normally used to buy or sell your crypto while centralized ones pretty often provide access to margin trading.