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The blockchain is decentralized while the website is not as far as I know.

How can we help the blockchain... I mean if there are no program to set up as node or something. To make steemit blockchain more sprearded and decentralized, then isn't steemit on the point of failure?

I just want to know more about it from people who are here more than I and have wider knowledge.

Nope, you can be flagged to death if you will turn some big players against you.