Fun facts

Number of contributors to gnome-shell code (ie, the js and src directories)40
Number of contributors to gnome-shell code who work for Red Hat8
Percentage of gnome-shell code written by Red Hat by lines91%

Which, I'll admit, does make it look like gnome-shell is controlled by the sinister Red Hat shadowman that rejects external contributions in order to keep a tight reign on the project and prevent Canonical from improving the desktop Linux experience. Let's check Unity.

Number of contributors to Unity code (ie, the unity and unity-priv directories)10
Number of contributors to Unity code who work for Canonical10
Percentage of Unity code written by Canonical by lines100%

Yup, it's a conspiracy.