Going to the website that is data mining you and putting your personal details such as phone, address, full name and email feels counter intuitive. Not sure I feel comfortable doing so.
They have much more than your SSN already. And your all of your info is for sale.
After all, you're tech literate (suggesting income) and privacy aware (suggesting your information may be scarce)!
(I assume most of these groups are more honest than that, if only because data reselling is legal but that wouldn't be.)