I used gVisor to sandbox containers for a short-lived "free-tier isolated-kubernetes-namespaces-as-a-service" startup. It was really neat, and it worked pretty damn well. Alas, we were attacked constantly by crypto miners and failed to make enough money to keep the free-tier online.<p>I still think there are some really fun projects yet-to-be-built harnessing very solid sandboxing. I had dreamed of a full-stack geocities revival. Oh well. +1 for gVisor, hopefully filesystem IO is faster now than it was several years ago.