Ethereum is a decentralized blockchain platform that allows developers to create and deploy decentralized applications (dApps). Ethereum uses a consensus algorithm called Proof of Stake (POS), which is designed to be more energy- efficient and decentralized than Bitcoin's Proof of Work (PoW) algorithm.
Is ETH really decentralized? Can you think about it carefully and see if he changed the underlying code from pow to pos after all the nodes voted for it? Will these miners agree to convert to pos? Their development team can change the underlying code themselves, and this power is concentrated in a few hands