It wasn't technically rolled back, a hard fork moved funds out of contract. There was a big push to make another recovery via a hardfork in 2018 (Parity multi

It wasn't technically rolled back, a hard fork moved funds out of contract. There was a big push to make another recovery via a hardfork in 2018 (Parity multisig hack) and it failed, so most likely no hack is ever going to be big enough again