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Steem does take that into account. That's why everybody has the opportunity to use upvotes OR downvotes. The idea is that the biggest accounts (the whales) have the biggest incentive to make sure that this type of abuse doesn't pay out, as they have the most to lose if the whole system goes to shit.

@lukestokes made the call to action, and the whales responded by downvoting the content. it continues in a perpetual cycle of whack-a-mole. Vigilance is the eternal price of wealth.

This is exactly how Steem is supposed to work.