Bungie dreamed up this whole "Sony Early-Access" thing as a way to trick trolls into exposing themselves. That way they will all be muted by beta-time.
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I still stick by my theory that, since Destiny will be Bungie's first game to include PlayStation, Bungie will need more time to make sure Destiny will be good for PS. I don't think there will be as many problems in Xbox beta since they've been making games for Xbox for 10 years. I see the early access as a precaution.