You said you would expect any third-party app store to show a "*demonstrated*" history of preventing fraud, with metrics similar to Apple's. Since we're on an article about Apple publishing such metrics, I would say it is safe to assume that the metrics on this particular article are the metrics you are referring to.
If I'm making a false assumption here, I'm open to you linking to whatever other supposedly "proven" metrics you might be referring to, which are backed up by some actual data and have come from someone other than Apple themselves.
If my assumption is correct, and these are the metrics you want other app stores to match, then my question stands - would you accept those other stores to merely "*demonstrate*" their history of matching these metrics in exactly the same manner that Apple has "*demonstrated*" their metrics here? If not, why not?