That's a bit like saying "Yeah so we don't care what reddit does, because you can always go somewhere else"

It's the biggest instance, so it's where most of the community and content would be etc etc. Just like what happened with beehaw could happen to world as well. This is only true for a mature decentralized federated ecosystem with a lot of redundant communities so that if one goes down you can easily consume the same content from a different instence. Is that the case now? I would say no, so it's even less leader-proof.