We have a lot of odd integration points with Netlfix OSS and AWS.
It's funny, but providing simple things like a metadata service is valuable. Our internal Service Discovery relies on it (which is OSS). Also, VPC-integration isn't in Nomad, and again, the Netflix ecosystem expects it. These little integrations make your container appear more EC2 VM/Netflixy, and help leverage the ecosystem.
Releasing this even without abstracted integration sounds reasonable to me - this is a system you built primarily for internal use, and you're engineering strictly atop AWS.
If the community wants support for other providers, someone else can come along and re-integrate with another provider, and maybe see if/where it's possible to collaborate with you guys on small changes that allow for easy maintenance for everyone.