You don't need to allow others write access to your repositories on github. Simply have them fork your public repository but don't add them as a collaborator.

You don't need to allow others write access to your repositories on github. Simply have them fork your public repository but don't add them as a collaborator. They can commit all they want and send you or any one of your 'admin' collaborators a pull request. This idea that git/github is losing changes is not true. You have at least until the next time the gc is run (90 days at github?), which is well beyond the time required to resolve the issue in any active project.