What is so special about Steem is that every users owns a part of the network, and we vote for 30 witnesses to run the site. These can change, and have no official responsibility besides running the servers and voting on changes to the blockchain.

Anyway, this means that the community is responsible for keeping everyone else up-to-date, since there is no central person that is responsible.

Where else do we see a community controlling the platform as big as steemit ?