What I understand about this site is as under;

Steemit drive by gratifying public for publishing valuable content. Once you post, other people upvote your post, and you are pleased with STEEM Dollars. You can in turn trade these for Bitcoin or Ethereum.
These blockchain-based platforms are a genuine revolution, and permit us to have free accounts and it is only up to us to grow our blog and be rewarded by interacting with the community.