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They just make use of the Steem Power they have acquired. And with power comes both privilege and risk/responsibility.

Everyone's posts are automatically set to upvote as soon as it is posted.. so due to the 0.8.0 release and the 15 minute curation delay @blocktrades actually doesn't benefit as much as they would if they waited 15 minutes (as I understand it) so it's actually generous considering they[blocktrades] know that as a huge part of steemit all of their posts will trend..

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