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In this particular example, a huge downvote came from spaminator. A few bots also removed their upvotes as well. Getting on the trending page through bot upvotes can be very financially risky if your content looks like spam or 'might be' plagiarised.

Steem needs a real promotion system. Promotion through bot upvotes is just a spill over effect from buying votes. If Steemit changed its trending algorithm, User Authority for example. Buying votes would be purely for gains from ROI, which for most content is currently the case anyway. Just this time, bot owners won't be able to claim vote selling is for promotion.