Warning/banning for market exploitation = fair game. I've seen some games going to total s*** because of such people.
The other two, though, are just stupid. Especially the swearing one. This is not how you keep and increase your player base, this is not how you make your consumers happy. It really boggles the mind that such large companies making billions of profit cannot grasp such simple things.
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If you like Blitzball, try Captain Tsubasa II (in English) for NES!
Top games: http://unikgamer.com/users/vlado-309.html