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Agree. Google’s invalid traffic metric is more “what they’re willing to refund” than “total bot exposure.”
One extra signal I’ve found useful: conversion lag.
Bot-heavy campaigns often show a weird pattern where clicks spike immediately, but normal conversion timing breaks completely. If your usual 24–48h conversion curve suddenly flattens, that’s often a cleaner fraud signal than bounce rate alone.
By the time Google flags it, the damage is already done))
