Doesn't help without passwords, which present some ethical problems with helping spread them especially from that site as he gets some dumps that aren't public.

Doesn't help without passwords, which present some ethical problems with helping spread them especially from that site as he gets some dumps that aren't public. With my idea the people with the data would be able to directly shut down the accounts ethically. Maybe the proposal could also hash and salt the passwords before sending it to the site, which sounds even better for security and wouldn't be too much of a hassle for whitehats who want to help.