Not sure what direction you’re leaning with this one. From here:
OKD is the upstream project of Red Hat OpenShift, optimized for continuous application development and deployment.
So it’s the CentOS Stream of OpenShift. And just like CentOS Stream is openly available while Red Hat Enterprise is not, OKD is openly available while OpenShift is not. So revenue from OpenShift is used to support the development of OKD, just like with RHEL and CentOS Stream.