Depends on what kind of project you're working on. Creative Commons is not especially appropriate for software licensing, so it's perfectly sensible for GitHub to avoid recommending it.
This isn't just my personal opinion, by the way. The CC FAQ specifically says:
> We recommend against using Creative Commons licenses for software. Instead, we strongly encourage you to use one of the very good software licenses which are already available. We recommend considering licenses made available by the Free Software Foundation or listed as “open source” by the Open Source Initiative.
This isn't just my personal opinion, by the way. The CC FAQ specifically says:
> We recommend against using Creative Commons licenses for software. Instead, we strongly encourage you to use one of the very good software licenses which are already available. We recommend considering licenses made available by the Free Software Foundation or listed as “open source” by the Open Source Initiative.
-- https://creativecommons.org/faq/#can-i-apply-a-creative-comm...