I think defederating from them is a no-brainer for the fediverse, but who am I? Just a user of the fediverse. I do not own an instance. I choose the fediverse over meta and its facebook crap, so for me it’s a no-brainer. For owners of instances, maybe it isn’t such an easy decision. It costs money to run an instance, for example. Federating with the Facebook corporate goons at first will seem useful to some instances, especially the big ones that want to stay big and general. When the big and general ones that fall for Meta’s scheme to take control of things, the smaller instances on the fediverse that chose to defederate will be there to join.