MMO Tera is a bit less massive after the publisher have stated they'll be blocking IPs from Asia, Africa, Russia and The Middle East from connecting to the North America servers. The ironically named En Masse said in an FAQ: “While we appreciate that there are players in these regions who would enjoy playing on En Masse servers, it's unfortunate that the vast majority of Internet traffic we see from these regions are from cyber-criminals relating to account theft, gold-farming and other hacking behavior.” Blimey.
It doesn't say if there will be servers specifically dedicated for the blocked regions, some sort of Tera Wild West, but the solution paints a massive number of potential customers as criminals. As long as the North American gamers have a good time, put up a wall: everyone on the good side is fine, the people on the other are viewed as suspicious and shifty. Better to keep them out, so the rest can play nicely. It's not as if there's anything else they can play.