They offer two discrete services. One is a simplified AWS where the interface is something like Service Now and you don't have access to the environment to make control plane changes. The second (and newer) offering is that they will onboard to your existing AWS operating environment and assist with running your applications.
They do with app runner, but last I checked, for some reason services were capped at low CPU/Memory and didn't allow basic ECS features like attached storage. I think they also had another one... AWS is very fragmented and strange.
