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Nobody should have to pick the cutoff.
A click is fraud or it is not. Every other tool in this category returns a probability and asks you where to draw the line — which is a vendor offering you a degree of fraud, handing you the hardest part of their job, and quietly turning their uncertainty into your liability. There is no degree of fraud Metaphasic calls acceptable.
We make the call. We are accountable for it. There is no score to interpret and no threshold to tune.