Matt Simmons, the Standalone Sysadmin comments:
There are a lot of people scratching their heads on this, because there’s a widely perceived notion that CentOS is a direct competitor to RHEL, but that’s actually not the case. While I’m sure RedHat would love to make paying customers out of every one of the CentOS users out there, their REAL competitor is Oracle.
I admit, I chuckled a little when Red Hat joined forces with a project that forked RHEL so many years ago. This move does help the CentOS community in the support department. And it also tells Oracle that the gloves are off when it comes to community distributions.
Read more at: CentOS joins forces with RedHat