Former consultant here: There are a lot of entities out there that aren't really a good fit for Red Hat's service offerings, but who may still need the system. As others have said, Red Hat is a great provider if you may need support from someone deep in the bowels of the exact code you're having a problem with.

Having consultants out there using CentOS/Rocky/whatever gets these "not a good fit" customers burden off Red Hat, which is probably an advantage to them. I operated what amounts to a "phone a Linux friend" service for ~18 years, and that sort of help just doesn't really fit into Red Hat's offering.

It's nice in many ways to be able to disconnect from the licensing model and just be able to deploy Linux boxes, but still get help when you need it. I recall one conversation about Red Hat licensing related to a machine I was installing for a client named "The Fedora Project" that went like this:

"I assume you'd like me to put Red Hat on there?" "Yes." "Can you provide me with a license key to use on it?" "Uhhh. Just go ahead and install CentOS".