I think you have a misunderstanding of what a US court can do. A court can only tell a specific party to take some action, and generally only if that party is somehow related to the legal action (such as being a defendant). Generally, there is no judgement that a court can make that can effect unnamed parties (unless they are John Does, which later have to be named).

Theoretically, you could sue each company with your data, and a court could tell each of those companies to remove your information. But it would have to be for each one, and the judgement is only binding on those companies.

Surely someone's gotta be willing to tell?

The techniques used are generally trade secrets, and amount to competitive advantage. There is little incentive for a company to reveal this information (or for an employee to do so, and thus open themselves up to legal liability).