And so on. Openstack is also many, many components, that can be pieced together for your own cloud computing platform.
Although it won't have the sheer number of services AWS has, many of them are redundant.
The core services I expect to see done first: compute, networking, storage (+ image storage), and a web UI/API
Next: S3 storage, Kubernetes as a service, and then either Databases as a service or containers as a service.
But you are right, many of the services that AWS offers are highly specialized (robotics, space communication), and people get locked in, and I don't really expect to see those.