two paragraphs down:

>In many instances, my call would come in just minutes or hours before an unauthorized payroll batch was processed by the victim company’s bank, and some of those notifications prevented what otherwise would have been enormous losses — often several times the amount of the organization’s normal weekly payroll. At some point I stopped counting how many tens of thousands of dollars those calls saved victims, but over several years it was probably in the millions.

Because Mr. Krebs was doing so with good effect and as a private individual he did not face the legal firewalls in place to prevent LEOs taking such actions for corrupt or ill intent or blow investigations.