Steem (not Steam) is compelling as a platform for games. It provides the complete package to game developers by providing instant infrastructure for fully ownable & tradeable in-game items, an in game currency and market, community content platforms with token earning (proof of gamer brain) and rewards for promoting the game.
Devs can just concentrate on gameplay and let Steem provide everything else.
Only problem is that people are going to get very confused between Steem and Steam!