I'm not sure game theory scales up to societal levels.
Not sure how far it scales, but if auction theory applies for a massive use case like Google's AdWords (see the wikipedia excerpt in my earlier comment), I guess it should have something to say about a platform the size of Steemit.
I agree with this (@ocrdu):
I don't think the original game-theoretical thinking that went into Steemit goes far beyond the one-shot prisoner's dilemma
Although, to be fair, they did incorporate the idea of a reverse auction into the early voting penalty, so it eventually extended slightly beyond the basic prisoner's dilemma, and into auction theory.
Auction theory will most certainly scale up in size and numbers, but I doubt it has the necessary width and applicability when it comes to modelling group or societal behaviour that is more complex than an auction. What I mean is: I doubt it can model Steemit well enough to do predictions. I hope I'm wrong though, as it could help if it would.