This is where Kubernetes I think helps a ton. I work with bare metal customers all the time that stand up OpenShift on their BM and can migrate k8s apps very easily. Depending on the apps you may need to throw an object storage solution in there too (such as OpenShift Container Storage). It does require a certain scale before this makes sense, but it's not nearly as high of a scale as most people think.
You go on to AWS for their managed services like Fargate, DynamoDB, ECS, S3 etc. Have used OpenShift in the past and had endless problems with cluster stability (especially in 3.x), and weird inconsistencies.
With AWS I could just spin up 10 Kubernetes clusters with pretty much unlimited resources, can't do that in OpenShift because you'd hit a resource quota or limit.
