Maybe you could post a little introduction/welcome text post on the communities you want spared.
As long as there was warning, that seems like a good way to spare small communities that haven't gotten off the ground while getting rid of squatters who aren't interacting at all.
Same, but I am optimistic that decentralization will lead to better options for dealing with the problems as they happen.
Might be unpolished, but at least it is ours.