Most kube focused customers move to GKE. It really is the best platform and Google is all in. Azure/AWS/etc see it as a commoditizing platform they don't control like Google does, so they'll never be the best.
GKE gives a sweet deal to encourage it because they see the long tail revenues.
It's a pretty easy decision for anyone based on k8s. I see this more a sponsored ad for kubernetes than I do for Google.