[precompute]

The "next generation" of Emacs contributors will be Emacs users and will not have any issues using email for collaboration.

Git was made for email. Needing a separate service for it is mostly cruft, when you have mailing lists. Yes, github has mass appeal, but a lot of software has been written with just email collaboration.

As for attracting low-quality contributions, I don't think they matter. People who use Emacs and depend on it will contribute. Interest in Emacs has increased and so have the available features.

[legends2k]

This! I'm happy that Emacs isn't the greatest editor or the most-used/-popular; it needn't compete with say VSCode or vim.

There's a decent, loyal user base, importantly not the free-loading, entitled kind who water it down; they're like-minded, appreciate the philosophy behind it, don't mind tinkering with some LISP here and there, contribute their creations as answers or packages, and above all form a nice community helping each other.