i guess it would make sense because the main philosophy behind cinnamon is to bring back old gnome2 and despise new gnome. it's almost like they're trying to make it better (i believe both cinnamon and gnome are awesome!!) and eventually make cinnamon the default de someday, has there been any sort of rivalry between the devs of both desktop environments?? like, i know it's not possible but what if a gnome update wouldn't let you install cinnamon and vice versa??
For the most part, large open source projects are worked on by adults not children.
This is the right response to the OP's bizarre "question", of course, but ... yeah ... the 'for the most part' qualifier is key here.
No rivalry, both projects serve a different crowd with different use cases and preferences. Some people like both, some people like neither, that's the beauty of Linux and FOSS, there's something for everyone.
The distros such as Debian, Fedora, Arch, and Ubuntu make all kinds of DEs available to the user to install. Gnome is not in charge of this, and even if they were, the suggestion that they would make other DEs unavailable is childish. You have plenty of choices
there are a lot of strong feelings about gnome but i have never taken the time to find out what or why
