The OCI image format is an established standard and registries are supported across tools. Publishing an image on Docker Hub also makes it available to tools like Podman that don't require a runtime and can run rootless containers. You're also free to download, extract the image and run the binaries however you wish, even outside a container.

Docker is a packaging format with a distribution platform and a common execution interface. I see offering it as an option to users only as a net positive. Not to mention that it opens the orchestration door making the application easy to integrate into CI pipelines and complex workflows.