Why Over 913,000 Ethereum(ETH) Is Lost Forever?

In the decentralized world of Ethereum, once a transaction is confirmed on the blockchain, it is permanent and irreversible. How Much Ethereum Has Been Lost? According to Conor Grogan, Director at Coinbase, over 913,111 ETH—worth approximately $3. 4 billion at current … source: https://coinpedia.org/news/why-over-913000-ethereumeth-is-lost-forever/