If a bug was discovered in bitcoin that robbed 80% of its users in some unexpected fashion, the network would probably hard fork too. All ETH did was basically

If a bug was discovered in bitcoin that robbed 80% of its users in some unexpected fashion, the network would probably hard fork too. All ETH did was basically a 51% attack by stakeholders in the network. One lesson is not to trust ANY contract to be immutable if it manages an outsized chunk of network capital. Another is that Ethereum will beat its private competitors, since for contracts to be trustworthy they will need to run on the biggest and most diversified network there is.