But Kubernetes, being a former Google project whilst donated to CNCF, is still one of the mainstream container orchestrator if not the biggest one (I believe we need to go over to supercomputers for that). Nomad is kind of dead and Apache Mesos is basically dead. Leaving Kubernetes as a natural moat, plus Google employees are still seemingly actively maintaining it.

And also Go. While I'm not a Go guy (speaking as a C# and Rust guy, I did wrote a good amount of Go before) it has a huge dominance in Cloud-Native application. For one, Zitadel, an alternative to Keycloak, is written in Go and only takes a fraction of what Keycloak needs.

Flutter/Dart is catching up, but the ecosystem is still relatively weak.

Kubernetes and Go are not moats of any sort; Google doesn't make any money off of them, and they doesn't get them any useful user data like Gmail, Docs, etc. do.