This platform really fulfills all the characteristics of an MMOG (Massive Multiplayer Online Game). Roblox, for example, is centralized and has a virtual currency of its own, Robux. Steem is decentralized but otherwise there is no difference in principle. Yes, you could argue that STEEM can be staked but Steem Power is not actually STEEM under the hood but Vests, a third token. So, in essence, Steem is a platform where you can earn tokens based on how well you play the game(s) playable on it.