Except in the credit report they only list your lenders and how much money you owe, and your payment history, and it's technically possible to not get any credit and have no information, or at least no recent information, in your credit report. In The Work Number, they not only list your employers, but also all your paychecks, and it's hardly possible to opt out.
Many credit reports contain work history.
Only fair if they also tell the candidate what the company pays other workers in similar roles. Transparency shouldn't go only one way.