Sometimes a GitHub Gist contains carefully crafted code that seems to qualify for what the Apache License would call a "original work of authorship", but the as far as I can tell the author never selected or knowingly agreed upon a license.
Is there a default license for content on gists.github.com?
What I assume is that code published in this way is not considered to be a complete work but only an example and can therefore be copied and used with or without credit to the original author.