I don't think there is much to be done about this. Since many Brazilian players suddenly started playing graal, they all met up in the starting area, (Balamb), and generally colonized the island since there were other Brazilians there.

It's possible many Brazilian players cannot speak English, so they simply do whatever they want. They don't understand anything outside of Balamb since all the Brazilians are at Balamb 24/7, and all they can do is interact with their own people since it's very difficult to try and communicate with someone from another place in the world.

I suggest we keep it this way, as well for every other country and their areas around Graal. As long as they're in their areas, they won't be bothering us non-laggers/delayers in the Battle Arena or towers. The tutorial is in English, so anyone who speaks English will know how to leave Balamb anyway. Brazilians or other non-English speaking people are probably too young to know anything about moving about in a game.