Because any other approach would be game-theoretic suicide. If it became common knowledge that you could threaten to sue Google to get special treatment, that's

Because any other approach would be game-theoretic suicide. If it became common knowledge that you could threaten to sue Google to get special treatment, that's exactly what everyone would do in every situation where some kind of special treatment was desired. The special treatment would no longer be special; it would be the normal treatment. And so the typical costs associated with handling developers detected as fraudulent by automated defenses would skyrocket. Somebody would have to pay for that, either the shareholders (lol, not likely), or non-fraudulent developers, in the form of handling fees.