scooterdude - 12:38 am on Aug 24, 2012 (gmt 0)
Ever since Google became a registrar, they say they are not using the Whois data this way. There are many other "footprints" they use to find common sites to one owner.
perhaps this is another of those items of 'faith' that might be somewhat rocked by future clarification of why major Corp might pay for registrar status for no reason we on the outside can discern.
Some folks actual experience might contradict the above quote, but such claims are currently not worthy of weighty cognisance :)