> [...] and to reproduce Your Content solely on GitHub as permitted through GitHub's functionality
Use, display, and perform through the GitHub Service are permitted according to the GitHub ToS, but not reproduce except on GitHub, unless further rights are granted with a license.
Any repository without a LICENSE file or license grant in code or README, and I could create one in a few minutes.
GitHub and GitCode do not provide an easy way to search for these, so you will have to scrape the API and clone the repos to find out the ratio of FOSS/restrictive/no license.
> [...] and to reproduce Your Content solely on GitHub as permitted through GitHub's functionality
Use, display, and perform through the GitHub Service are permitted according to the GitHub ToS, but not reproduce except on GitHub, unless further rights are granted with a license.