Board Thread:Game Discussions/@comment-24140216-20131216044945/@comment-24003134-20131218013126

It isn't really a bug, GREE intended it to be this way; when you bind and retrieve an account the old one is deleted. They just didn't see it being used in this way to gain referrals. They can't ban you, it's their own fault for not properly thinking it through, or putting a patch to stop it.