Github should donate a license for Github Enterprise to gnome so that the gnome folks can have the best of both worlds - self hosted + github. Its a win for github to have a big project like gnome running on GHE.
It is very hypocritical to promote free software while using proprietary software that you got special privilege for on the backend. KDE had the same line of thought when they chose Phabricator - if features like LDAP weren't locked behind Gitlab EE they would have used that, but they were only considering freedom respecting options, because they are communities of hackers that want access to improve their tools.
I wrote https://news.ycombinator.com/item?id=11092182 but I can't find LDAP references in any of the linked emails.
[1]: https://www.gnu.org/philosophy/who-does-that-server-really-s...