Yes, but crucially they are not the domain registrar, and that's because this was already a problem.
Honest and good registrars don't have a problem with WHOIS services, you claim they would since the emails they forward could lead to lost sales.
The WHOIS service is just as incentivized to filter out certain mails since they are paid by the registrar and thus get profit of sold domains.
Yes, but crucially they are not the domain registrar, and that's because this was already a problem.