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> One former customer service employee estimated that 60%-70% of the accounts they reviewed during a typical shift would have more than a dozen linked accounts. Another two former employees estimated 40% and 75%, respectively.

I don't think this necessarily means that 40%-75% of the accounts on Block's books were fake (as I took it to first mean from the summary). Could it just mean that the accounts that were set up for review based on high risk activity were predominantly fraudulent (as they should be)?