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Every abusive whale can be crushed by the collective.

True, if they got organised.

Number of DVs fell sharply after the first full day...

Most people who have overused bid bots are now very wary of doing that. The low hanging fruit have been picked. It's harder to find DV worthy material now. Sometimes it can be difficult to draw the line between abusive farming and acceptable use of one's SP for ROI. There are no generally accepted guidelines. Using all of your upvoting power on yourself is perhaps clear abuse, particularly now that curators get 50%. What percentage of your upvoting power used on your own posts is considered acceptable? What is the difference between a circle jerk and friends and acquaintances appreciating each other's content?