story
Nothing would make Red Hat happier than having every hacker under the sun using Red Hat - what they were attempting to do was keep the enterprise customers, who were currently paying $1000+/CPU (or so) go with a free alternative and kill their company.
Simply removing three things allowed them to do that: (1) No RHN/Up2Date available for Centos, (2) No Support, (3) Most importantly, absolutely no mention or reference to "Redhat" Trademarks.
Centos had everything else.