OpenShift predates Kubernetes by a bit, and IMO they operate at different levels (OpenShift is "deeper" and overlaps in some spots with Kubernetes). Also, I'm just about 100% sure no one is stupid/brave enough to challenge Kubernetes' current dominance in the container orchestration space right now. Kubernetes is complete enough and not-bad enough to be the defacto choice right now, and I doubt much will change -- plus Google is backing it, along with the CNCF, there are so many companies with a (in)vested interest.

I do think Red Hat replicates features that Kubernetes does well and trying to do those things well but they operate at different levels fundamentally -- Openshift is like a bunch of individual components that work together (usually at a lower level than Kubernetes does) and Kubernetes is like one coherent platform that smoothes over all the lower-level stuff (CRI, CSI, C*I)...