[javitury]

Those are different Red Hat products and belong to different layers of the cloud stack.

Previously third party developers targeted RHEL directly, enhancing the RHEL ecosystem. Red Hat could play long term by (indirectly) giving away the base product to the community, and profit from the increase in support subscriptions.

New projects don't target RHEL as often as their primary platform, they prefer containers now. There is less ecosystem enhancement and it's more profitable to milk existing RHEL users. Centos Stream makes it possible to smooth the transition to the new paradigm.

Openshift, Coreos, etc have different purposes and follow different market dynamics. Mainstream developers don't target them directly.