Google is a Domain registrar. Will they use the whois function?

Will google use the whois to reveal owners of networks?

[baron13]

Since some time google is a registrar. Will Google now have the capability of not only finding out sites/subdomains which are hosted on different sites, (different c-classes) but also find out if they have the same site "owner/ registrant"?

Google reveals if domains are coming from the same c-class or if the link exchanges are from the same c-class. A solution to avoid this, is to move the sites/s to another webhosting company with different c-classes/IP's.

But will this not be possible anymore because of the registrar position of google?