I have changed my main website to private registration. I have noticed less CPM and less earnings since. This could be totally coincidental, but maybe not. Do you know anything about Google treating private registration sites second class ?
They better not, they register all their new domains and projects through third parties to protect who really owns it. I don't think they would...
I have all my domain names whois protected and i think it`s ok. It has nothing to do with google i think I had some problems when signing up at some affiliate programs and they requested me proofs that o own the domain
I guess it could be seen as a "spammy", hide your identity thing to do. However, I can't see them doing it. As mentioned before, they do it themselves a lot of the time.