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This is different. Steem is much bigger than NAV and has a blogging platform attached that shows up pretty high in Google search rankings. Further I suspect that the Coinbase poll had some T&C attached which I haven't seen for this (though I may have missed them). Also Coinbase doesn't have a great reputation in the crypto community anyway.

I don't think there needs to be T&C. BTCC never said "We will add the winner".

We will have to disagree on this.