"The GitHub CLI team is focused solely on building out the new tool, gh. We aren’t shutting down hub or doing anything to change it. It’s an open source project and will continue to exist as long as it’s maintained and keeps receiving contributions."
"hub is a project whose maintainer also happens to be a GitHub employee. He chooses to maintain hub in his spare time, as many of our employees do with open source projects."
My experience at FANMAG has been that "spare time" is the scarcest of all resources.
They have a document where they expand on this: https://github.com/cli/cli/blob/trunk/docs/gh-vs-hub.md