True but, bungee will figure something out

You can't. It's already been stated that we won't be able to do PvP without doing campaign, so it would be difficult. Nevermind the fact that a guest wouldnt be able to save progress (which would negate the entire concept of the game). Also, what about balance? If you always use a guest account, yo would always start from lvl 1, and that's no fun.