Kubernetes is opensource-by-Google. It's suprisingly open, and still alive, which is better than almost any of the other Google known projects. (Chrome and Android come to mind, but Android is write-only, and Chrome isn't that great at listening to users either. Not that Mozilla is better about Firefox stuff, but the Rust team is wonderful.)
I find it pretty terrible that Kubernetes develops on Slack/Github/Videochats. For being an Open Source project, it rejects open source tooling and makes it difficult for people with poor english skills to participate (text-based meetings are much better for inclusiveness). Even if you do listen in on the video meetings, they give you a feeling as an outsider that many of the decisions have already been made elsewhere (some obscure github issue conversation, a google doc comment on a 1 year old doc, etc). It seems the only way to meaningfully participate in the k8s community is to be a known insider... :(