As a devops, I rely heavily on Hashi and Ansible and Chef and so many other tools. However, their enterprise offerings are both too expensive and also too big for what I need. I can't get my employer to just donate money, so what can I simply and easily buy to fund the effort while still getting some value?

Grafana, for example, with paid plugins has made this easier: the moment you need a bit more, you pay for it. We need to extend this model out somewhat, get these vendors to offer more premium functionality - generally in the form of charging for integrations with other closed source software. That if you stay open the whole way yourself you can probably do the whole thing for free; conversely, if you have money for Datadog or whatever other service, then you probably have money to attach Grafana to Datadog too.

The real money is with the organizations that feel the need (for many good and bad reasons) to pay millions of dollars for support, consulting, and the like. They don't care about the people that are looking to save a few grand on licenses.

It's possible that the existence of CentOS is partially keeping RHEL viable. Maybe Fedora would be enough to do that, but overall CentOS probably contributes to RHELs demand, rather than detracting.