I have not heard of anything yet for CS and other online games as far as betting using bitcoin or other cryptocurrencies are concerned. I mean online games are already a long time development and we see not betting but rather straight forwards competitions between groups of people wherein, the loser will always be the one paying the winner with cash bets or value goods. I think there might be localized bets happening but not the large one where it cross cities or states. I am not sure though, maybe there are.