I wondered about this exact risk as I learned about the "overemployed" phenomenon. It feels like a matter of time before credit bureaus offer this as a service to the many corps that already pay them for credit checks. It's hard to be legitimately employed without a data trail these days.
>For a company like Equifax, this trends represents a potential business opportunity. The company sells a product called Talent Report Employment Monitoring so other companies can keep tabs on potential moonlighting by their employees, too.