Like Copilot CLI, but now Copilot also has a desktop app. Next to github.com, GitHub Desktop, GitHub Mobile, and Copilot in VS Code, somebody will explain the strategy of this... one day.
To quote from the article: "These repositories, belonging to more than 16,000 organizations, were originally posted to GitHub as public, but were later set to private [..]" Once things are public, they will forever remain public (in some form). That's how the internet works.
tl;dr Bing indexed and cached a public repository, then made it available to its AI chat. Later, the repository author switched the repository to private and understood how the internet works. And the story gets only better as the author is the founder of a “cybersecurity” company.