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Well, I am not "featuring" whole posts.
I am choosing posts, commenting them, and encouraging steemers to read and upvote the original posts.
So, the deal seems fair to me as I offer authors a "bonus" on top of what they can earn directly.

I have eventually decided to give 100% of the earned SBD to the promoted authors.
At the same time, having seen how controversial these "promotions" are, I think I will stop my initiative. I have so much stuff of my own to write about and I don't want to get involved into hate campaigns or similar.