You know what would make whois data more accurate? Requiring that registrars provide basic anonymization without any extra fee and build a meaningful process for situations where breaking that anonymization is actually the right thing to do (ie. not an opportunity for collection of bulk mailing address and phone number lists for spammers and phishers).

It would cost the registrars something to do so, obviously, but so does this. And a basic level of privacy should never have been allowed to become a premium service to begin with.