They are not using Docker at runtime for their services. Every company uses Docker for builds unless they have a particular cost or ethos they're avoiding and

They are not using Docker at runtime for their services. Every company uses Docker for builds unless they have a particular cost or ethos they're avoiding and purely using Linux/podman/buildah/et al. Thinking about it a little further, though, I believe Rancher Desktop has come a long way and may be eating market share.