ETH rollback impossible without fucking over the other chains due to all the swaps that have already occurred.
Discussion
there was never an ETH rollback. it's misinformation. it had an irregular state change, targeting specific accounts. a rollback is a totally different thing that affects the whole chain history.
bitcoin had a real rollback. everyone's transactions got undone, not just specific ones.
to be fair, the bitcoin rollback was in response to a legitimate protocol bug, whereas ethereum's irregular state change dealt with a mistake in a user submitted contract object. there was no protocol bug.
I am aware. The situation was very different in the past. They also had a 30 day lock-up period in the DAO hack where they could coordinate before the hacked funds could move.
you could do an irregular state change on ethereum to claw back funds, even if these funds were migrated to rollup L2s. this is because these types of L2s store their state on L1. not enough people understand rollup architecture. every rollup block is built on top of the previous state that was saved onto L1. to adjust the state on a rollup, you have to adjust that data on L1.
a fork could force any kind of state change on L1 or L2. the only reason you can't do it is that it's no longer possible to identify all the accounts in possession of the stolen ETH. they were put through tornadocash and other things. even if the community wanted to do it (they don't!!) they wouldn't be able to do it correctly anymore.