"In June 2016, Ethereum found itself under attack when an unknown hacker made use of some existing vulnerabilities to steal more than 3.6m Ether that is $50 million worth of cryptocurrency. And then they froze the alleged hacker's account and did a hardfork to undo the transaction."
How Ethereum Reversed a $50 Million DAO Attack!
Any cryptocurrency that rolls back on the blockchain in order to undo a transaction or block funds is nothing more than a shitcoin...