I don't think they're using their upvote power to DV, they're just using the free downvote power that came with hf21 to target SBI buyers. And be forewarned, they sometimes wait a few days and get posts just before payout. But also, they're only targeting the biggest sponsors of SBI. There's not enough to hit everyone, I imagine, (or maybe they have enough, I dunno) but presumably if they can intimidate the big supporters they'll be able to intimidate smaller sponsors, too. I'm just guessing at their strategy, but that's my guess.