https://nano-editor.org/news.php:
And, with this release, we take leave of the herd... Bye! And thanks for all the grass!
http://git.savannah.gnu.org/cgit/nano.git/commit/?id=3e5fcec76c12b45a5dd12cb731e160c8e8fb1e0c: «remove the GNU marker from nano's name».
Вот и всё.