“Instant Ubuntu VMs” — much better title.
“A mini-cloud on your Mac or Windows workstation” — much better clickbait.
“A mini-cloud on your Mac or Windows workstation” — much better clickbait.
A cloud is a separate set of resources you get to use. They will be there when you go back to them. They will stay there when you don't.
I've not finished reading all the docs, but it just seems like easy vms.