I think (or rather assume) that the issue is that GitHub receives a grade F ("unacceptable") evaluation acccording to the GNU Ethical Repository Criteria; https://www.gnu.org/software/repo-criteria-evaluation.html. So does SourceForge, by the way. While there are numerous references to GitHub and SourceForge in Emacs (and some components even nominally live there, by the way, eg CEDET, cc-mode...), it's rare (unique?) for running a GNU Emacs command to actually print "hey, go install something from this non-ethical repository to finish doing what you wanted to do". It's a different level of referencing.
- [O] bug#32722: bug#32722: 26.1; Org-publish depend on no... Nicolas Floquet
- [O] bug#32722: bug#32722: bug#32722: 26.1; Org-pub... Robert Horn
- [O] bug#32722: bug#32722: bug#32722: 26.1; Org-pub... Eli Zaretskii
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 2... Robert Klein
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 26.... Kaushal Modi
- Re: [O] bug#32722: bug#32722: bug#32722: bug#32722: ... Kaushal Modi
- Re: [O] bug#32722: bug#32722: bug#32722: bug#32722: ... Richard Stallman
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 2... Richard Stallman
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 2... Richard Stallman
- [O] bug#32722: 26.1; Org-publish depend on non-free ... Glenn Morris
- [O] bug#32722: 26.1; Org-publish depend on non-free ... Nicolas Goaziou
- [O] bug#32722: bug#32722: 26.1; Org-publish depend ... Amin Bandali
- [O] bug#32722: bug#32722: bug#32722: 26.1; Org-publ... Kaushal Modi
- [O] bug#32722: bug#32722: bug#32722: 26.1; Org-publ... Richard Stallman
- [O] bug#32722: bug#32722: bug#32722: 26.1; Org-publ... Eli Zaretskii
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 26.... Joe Corneli
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 26.... Richard Stallman
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 26.... Joe Corneli
- [O] bug#32722: bug#32722: bug#32722: bug#32722: 26.... Richard Stallman
- [O] bug#32722: bug#32722: bug#32722: 26.1; Org-publ... Eli Zaretskii