People have the ability to block communities as they see fit individually and also follow whatever communities they want and only browse their subscribed list. (steering wheel)

But when popular communities are on an instance that is very much “get on board or get out” to the point they ban users from every community on their instance for having differing political views, it is very much reasonable to try to start or promote communities run on different instances controlled by better admins. (where the roads go (ok, so building roads is a bad analogy, it is more like when a place has terrible sidewalks so people walk through the grass and they wear in those little dirt-path short cuts and eventually no one uses the sidewalks))