Although I absolutely loathe servers that sell ranks, privileges and so on, this method of drying out their playerbase is, IMO, the worst course of action that could possibly be taken.
It is censorship, that may or may not extend to other, EULA-abiding servers in an effort to push Realms.
Heck, if it were an optional switch that's defaulted to "ON" I wouldn't mind, most people who expose themselves to these "servers" are probably too braindead to even FIND the switch.
But this is simply despicable.
If there was a switch then there wouldn't be a point of the blacklist.....