Would be a great idea and I bet it could be successful, but maybe at a lower price point and using lots of automation of opt-out forms. As far as opting out of many credit reporting agencies, check out https://www.consumer.ftc.gov/articles/0262-stopping-unsolici... https://www.optoutprescreen.com/?rf=t

Also it seems like theres a service like this called Delete Me, but it also seems like theyre a manual opt-out shop. Would be cool if you could find a way to not have humans doing it. Bet they're just having people on amazon mechanical turk fill these out or something like that. https://joindeleteme.com/how-we-work/