Anyone can Access Deleted and Private Repository Data on GitHub.
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Anyone can Access Deleted and Private Repository Data on GitHub ◆ Truffle Security Co.
https://trufflesecurity.com/blog/anyone-can-access-deleted-and-private-repo-data-github
You can access data from deleted forks, deleted repositories and even private repositories on GitHub. And it is available forever. This is known by GitHub, and intentionally designed that way.