Kubernetes is supported on AWS by various companies in the industry, including my own, Kismatic (the enterprise Kubernetes company). We have been pushing for the team at ECS to adopt K8S as a standard framework on which to run containerized workloads. As Kubernetes gets adopted as a container cluster management standard for orchestrating and running microservice-oriented apps, all the cloud providers will need to support it based on customer demand, in the same way they are all supporting Docker due to the demand.