If the App Store is the only vehicle for selling mobile apps on Apple devices, then by virtue of their monopoly, they have a duty to be entirely transparent and fair. It’s entirely an Apple problem.
And it shouldn't be Apple's problem. Apple is not a court of law. They have no business knowing about their developers internal affairs, imagine the conflicts of interest. This is a matter for an actual court of law, that can issue warrants and subpoenas, where perjury is a thing, where there is fair trail and where you can ask damage and the guilty party get charged for fraud. You obviously don't want to give these powers to a private company.