That is because he's not an average blogger off Steemit. The people who are able to do well on Steemit from the beginning are people who already have an audience, a large social network, a lot of connections, a lot of resources, and it's no different than if someone brings a lot of Bitcoins to buy Steem Power directly. In this case it's people who are bringing celebrity status and social power from other places such as the anarchist community.
It's valuable to Steemit so Steemit rewards it. If any celebrity posts on Steemit it will be heavily rewarded at this early stage. So who is to blame if the other celebrity types refuse to post on Steemit? Bring your favorite celebrities to Steemit and upvote them.