"Nobody ever got fired for buying CentOS". Till recently.
In terms of actual, material benefits I believe it's simply because transitive "certifications" (hardware, support, continuity, ...) that are implied by Red Hat's corporate presence.
To add to this from personal experience; we sell proprietary software that runs on multiple platforms. Our market is broadcasters, CDNs, telcos, media companies.
We target Ubuntu and Alpine, but also ship CentOS/Rocky/RHEL/Oracle/Alma and Windows. Even though customers rarely ask for the latter targets, we need to offer those simply because we wouldn't be taken seriously if this major market segment were absent on our website.
In terms of actual, material benefits I believe it's simply because transitive "certifications" (hardware, support, continuity, ...) that are implied by Red Hat's corporate presence.