Well, it's bound to happen to some extent (e.g.: instances blocking lemmygrad), but you have a lot of power to mitigate this effect as an individual user. By default, nothing's blocked, so it's on you as a user if you choose to "live" somewhere that's interested in proscribing undesirables.

It's not a perfect solution. Perhaps leadership changes (or you change) and suddenly your interests are no longer aligned. Nobody wants to get stranded! Eventually maybe user migrations will be a thing, but for now we'll just have to do our best to choose our home-bases wisely based on our own ideological and practical needs (SDF represent!)