[tylerl]

This.

The whole point of k8s, the reason Google wrote it to begin with, was to commoditize the management space and make vendor lock-in difficult to justify. It's the classic market underdog move, but executed brilliantly.

Going with a cloud provider's proprietary management solution gives you generally a worse overall experience than k8s (or at least no better), which means AWS and Azure are obliged to focus on improving their hosted k8s offering or risk losing market share.

Plus, you can't "embrace and extend" k8s into something proprietary without destroying a lot of it's core usability. So it becomes nearly impossible to create a vendor lock-in strategy that customers will accept.