The problem is that this does not model the situation accurately; there is no known malware available for download on the App Store to my knowledge. Any apps th

The problem is that this does not model the situation accurately; there is no known malware available for download on the App Store to my knowledge. Any apps that actually do get past review unfairly (by using private APIs or otherwise) are quickly removed. Your model implies that Apple is willingly letting malware stay up on the App Store, which is not the case.