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Hi @r-a-h-u-l, an author can decline a payment for any reason they feel like, however, they may feel particularly inclined to refuse payment if they are promoting a product or service outside of Steemit that they will receive compensation for.

This comment has received a 9.45 % upvote from @booster thanks to: @elliotjgardner.

It is just a choice of the author. You can pick any of the three options above and so does anybody else.

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