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This is a great question. I might be wrong but in my opinion Steem is distributed due to the fact that it has witnesses supporting and maintaining the blockchain. Before I go further I want to ask around a bit just to confirm my thoughts. What is your opinion?

I do think it is decentralized. The nodes are represented by the winesses who are actually mining the blockchain. I could elaborate more, but I saw a Steemwhale who is still active but does not post anymore writing an article about Steemit being quasi-decentralized. He also provided some nice images in his posts, hehe

https://steemit.com/steem/@steemed/steem-png-01-consensus