Wow. I didn't know this existed.

Do you know the data-source? Is it primarily from your self-declarations to your credit card company? Or do they have access to tax records?

The usual whoring out of personal info by third parties:

"The Work Number receives data directly from employers, payroll providers, or third-party administrators that choose to use The Work Number for employment verifications. We report your data as we receive it from these sources."

https://employees.theworknumber.com/faq#:~:text=The%20Work%2...