Automated bidding (Smart Bidding)

Bidding strategies — Target CPA, Target ROAS, Maximise Conversions, Advantage+ — that buy more traffic resembling whatever converted before.

They have no model of whether a conversion was a person, so fake conversions steer them to buy more fraudulent traffic. The cleaner the fake conversions look, the harder the strategy pulls budget toward the source that produced them, so a single seeded conversion can compound into a larger misallocation over a campaign.

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