I had a raid6 array going almost bad when 2 HDDs called it a day at the same time years ago. Had to send the entire office of 30 people to unscheduled holiday for two days before the array was rebuilt with new drives. Third drive failing during the rebuild would likely result in a week off as the storage would need a full rebuild.
I can imagine something similar happening here, however there should be a fail over storage setup in case they're selling a service.
EB or ECS specific knowledge is AWS specific. I can (and do) run k8s on my laptop and can (and do) deploy Helm charts (the ones I wrote or 3rd party ones) on any k8s install. So that's quite different to the usual vendor lock in that comes with proprietary cloud services.
I can imagine something similar happening here, however there should be a fail over storage setup in case they're selling a service.