Please don't put words in my mouth. I said it frees you from lock in by a single cloud provider which it does.

The K8s docs offer ways of running on-prems, you can do it with nginx ingress daemonset + DNS pointing to the IP (or CNAME) of your workers.

It's all covered quite well here: https://kubernetes.github.io/ingress-nginx/deploy/baremetal/ and we use it in production.