I was under the impression that CentOS mostly competed with Debian or Ubuntu, with the added benefit that switching from CentOS to RHEL was very easy. RHEL pro

I was under the impression that CentOS mostly competed with Debian or Ubuntu, with the added benefit that switching from CentOS to RHEL was very easy. RHEL probably competes more with proprietary Unix systems (although they all seem to be fading to oblivion these days), SLES, or Windows. Maybe z/OS on mainframes, but I suspect Linux deployments on those machines are more like "We already have the mainframe, let's buy a couple more CPUs and RAM and put Linux in an extra LPAR or VM instead of buying new servers".