BitMEX co-founder Arthur Hayes suggests Ethereum rollback to cancel stolen funds after the Bybit hack.The suggestion is based on Ethereum's previous action in 2016 when a hard fork was used to address a security breach.Bybit recently experienced a hack resulting in the loss of $1.4 billion worth of Ethereum, the largest in crypto history.There is debate within the Ethereum community regarding the rollback, as it could violate decentralization and immutability principles.