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It's bad advertisers, they come in and set up some dummy campaigns to get approved and then when they think no one is watching, they flip it and increase their bids to soak up as much volume as possible before they get found out and banned. They also load accounts with stolen credit card information as well so they hit the networks double, 1. for tons of traffic/fuck over the users and 2. the traffic is all free because you have to refund the cards or get the charge back.
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