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.