redhat has benefitted from centos and the other clones immensely by the fact that an entire generation of SREs trained on their distro. entire businesses (like my old one) were built around partnering with redhat and providing support and consulting for RHEL and the clones.

the redhat partner network was bootstrapped on the back of the clones. you lab with the clones and then start working with the real thing.

and yes, sometimes users who wanted support went with consultancies like mine and not upgrading to RHEL, it’s true. but that does not matter because when consultancies like mine were working on large contracts with large commitments we would suggest that RHEL be used instead of clones so that there was a point of accountability.

and really, that is and remains the only reason to buy a commercial Linux system: the contracted accountability in the form of the SLA. if a deployment does not require an SLA, then withholding the product just creates a situation where they will use a different one.

that results in a brain drain: the users who would have stayed in your ecosystem (via a clone), will now go learn a different ecosystem. and this causes you to lose your partner network as consultants retire.