I believe it actually installs the Docker community edition (CE) which is under the Apache 2.0 license. Docker (the product) is assembled using the Moby libraries and components.
Correct, Moby is not a distribution of a container runtime.. it's not the "docker" you are looking for. Docker CE is and that's what's used in the guide.
Full Disclosure: I, Manik Taneja, am the Product Manager for all the open source efforts at Docker and work on the Moby Project.
As suggested here, the blog post only talks about installing the Docker Community Edition (CE) that is published under Apache 2.0 License. This is the official incarnation of the Docker Product and is provided to have:
- a consistent user experience across different linux distributions
- strong security guarantees
- regular bug fixes and updates
Moby Project serves as the upstream for the entire Docker Product and includes all open source components that make up Docker, such as runc, containerd, notary, moby, infrakit, linuxkit, libnetwork, hyperkit, vpnkit, datakit, etc.