[zeta0134]

I imagine the licensing goes something like this:

https://www.docker.com/components-licenses

It's my understanding that the bulk of the components that make Docker work are fully open source, and some extra support and deployment related things are the only things that are commercially licensed. This would include Docker Swarm, as it's a part of Docker itself and not something separate. IANAL though.

I'm pretty sure the reason they go for plain Docker over Moby is sheer ease of use. Despite being a bit weird to understand under the hood, Docker is just dead simple to get up and running with, and using the clustering mode that's built right in is easier to teach new readers than Moby, which from its Github page is obviously designed for folks that are already rather comfortable with Docker. Straight from Moby's Github page:

"Moby is NOT recommended for: Application developers looking for an easy way to run their applications in containers. We recommend Docker CE instead."

https://github.com/moby/moby