I suspect you may be surprised which instances get islanded off from the rest of the fedi.
Or rather, which ones already are.
Or rather, which ones already are.
When you block other instances you realize you are islanding yourself off, right? Not the other way around.
Everyone is federated until you block, so you are isolating yourself from the norm when you block others.
It's not too noticeable as the english speaking instances are small currently, but those who don't want wolfballs and friends, or this or that are more isolated than those who do.
It makes sense that those who want to hide views from others are the outliers. Those who want to be open and allowing of diverse thought are more interoperable.
My argument is that if a server behaves in a way that the majority of large servers block it, then it is islanded, not the others.