A number of customers want to provision operating systems that are not on the standard operating system list: https://metal.equinix.com/developers/docs/operating-systems/supported/
Equinix Metal allows for provisioning custom images: https://metal.equinix.com/developers/docs/operating-systems/custom-ipxe/
However, this requires maintaining a PXE server.
Provide a service where customers could upload their operating system images. These would be distributed within the Metal cloud and could then be provisioned by the customer on their server instances.