My only criticism of it would be in some heated debate scenario. Where a conversation started really ugly, but eventually became a teaching moment (as much as I hate that phrase). A lot of respect could potentially be earned by the people for resolving their differences. A throwaway could make this less achievable as people gravitate to it for protection. Then again, if the catalyst for such a conversation can only be garnered through the throwaway in the first place - it could be a good addition.
I'm all for an experiment though and love the idea that it is one shared mask.