[JCattheATM]

> Docker Hub is hardly a “runtime”.

In the context of your question Hub makes sense, as it is something Docker maintains that most podman users still rely on

> Compose files aren’t a replacement for Docker Hub.

Correct, but most compose files refer to Docker Hub.

You seem to be highlighting that alternatives, which I don't dispute, but most people are overwhelmingly using the services that Docker maintain. That's the answer to your question. Read up a few replies if you've forgotten the context.