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They could make sure you never make money off a post again. While their upvote is worth a lot of money, their downvote is worth a lot of negative money.

And when your post goes below 0 dollars, it gets hidden and your reputation goes down.

hmm, that doesn't remind me of anything...
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Right you are hahaha! Black mirror has made it's first accurate prediction

Luckily, if your account is destroyed by a whale, you can make another one but it is a very scary prospect.