Game theory is incredibly interesting. Prisoner's dilemma is one of the most discussed games. Prisoner's dilemma is a bigger problem for one-off games.  Repeated games are mostly to reach some form of cooperation to avoid perpetual defecting. 

Steem bid bots are a perfect example of prisoner's dilemma for both buyers and sellers. Lucky for us it is a repeated game with infinite rounds. 

In reality there are games within games which involve competition and cooperation. I think many focus on competition but cooperation has great potential especially for smaller participants.