From my experience, deploying to a k8s cluster managed by someone else is extremely simple and straightforward. Tell it which container to run and off it goes. You get zero-downtime rolling deploys, automatic restarts on crashes, easy rollbacks, service discovery (if you have multiple services) and more for free.

Managing a cluster is the tricky part of k8s but just running your stuff on an existing cluster is extremely straightforward. I could definitely see the attraction of a cheap managed k8s cluster with a single node. Maybe hosted k3s or something.