To me there seems to be an inherent catch-22 involved in that. To be responsible, you have to confirm the person requesting the information is the person that wants doxxing. In providing evidence you are who you say you are, you're seeding that company with information to better find you that might not be easily found otherwise. It would take a strict separation of the sales and operations teams, to make sure this was a useful and accurate service, and with all that work it likely wouldn't be cheap.