I feel that they feel bad given how much effort they've put into ECS. But other companies also talk about how they have to scrap years of work and fully working orchistration systems since K8S came out. I personally don't think that ECS stands a chance. Given Ali cloud and other cheaper cloud vendors would provide K8s. Sometimes I'm even thinking of just buying a physical server and moving some of my workloads there. It looks like there's no stopping of K8S now. It's "Android" for the cloud. Sure they'll be edge cases, but K8S will eat up the lion share of the market.