I think any multiboxer attempting this should be perma banned if they can't maintain a >50% win/loss ratio. Battlegrounds are a part of the game in which we do effect other players greatly without their consent. Those players being our teammates. It's different from consenting wpvpers and pve. Even pve raids have a choice whether to play with you or not. And if you're handicapping yourself, not just 1 character but many characters, in a competitive match that involves outsiders, you better be good enough to not be an anchor on their chance to enjoy the game.