In times where developers decide to leave GitHub for good reasons, it seems anachronistic to enforce a stronger vendor lock-in in favour of GitHub than what the maintainer-list.nix suggests. Plus, notifications through GitHub seem to be limited (https://github.com/NixOS/ofborg/issues/636#issuecomment-1465846203), while e-mail and Matrix might be more flexible here. So it seems reasonable to make sure there are no unnecessary hindrances for developers that wish to rely less on GitHub.
OfBorgis expected to notify maintainers when a pull request is made against the maintained package (https://github.com/NixOS/nixpkgs/blob/master/maintainers/README.md?plain=1#L59). Providing a GitHub handle is optional as long as an e-mail address or Matrix handle is given (https://github.com/NixOS/nixpkgs/blob/master/maintainers/maintainer-list.nix#L7). So it can be expected that not only GitHub users are welcome to contribute.However, there is information that a GitHub ID is actually required (https://github.com/NixOS/nixpkgs/pull/254299#discussion_r1320756169).
In times where developers decide to leave GitHub for good reasons, it seems anachronistic to enforce a stronger vendor lock-in in favour of GitHub than what the
maintainer-list.nixsuggests. Plus, notifications through GitHub seem to be limited (https://github.com/NixOS/ofborg/issues/636#issuecomment-1465846203), while e-mail and Matrix might be more flexible here. So it seems reasonable to make sure there are no unnecessary hindrances for developers that wish to rely less on GitHub.