What about unregistered data-brokers? I would he happy to sign up to webhooks for when someone wants to delete data.

Problem is though, you'd be revealing more data about them than I probably have by sending it.

Do you think you could be an unregistered data broker? You should probably reach out to me directly so I can give you more targeted advice.

All of the requests are SHA-256 hashvalues, they aren't transmitting any usable information in the process of sending the deletion requests.