This seems a flawed understanding of the theory though, if the thinking is that in the entirety of the whole world, no instance will ever defederate with any other instance.
On the contrary, this is normal, expected, and healthy behavior. When one instance refuses to consider the needs of the wider community, then those offended by such have the right to cut it off - e.g. hexbear users troll everyone, their admins protect them, so the instance as a whole gets defederated as a result.