Yeh, they don't want to give credit to anyone else, only giving attention to "Ubuntu". Even at the end when it says some literal credits, it only cites Ubuntu

Yeh, they don't want to give credit to anyone else, only giving attention to "Ubuntu". Even at the end when it says some literal credits, it only cites Ubuntu "and other open source software" (which is almost undoubtedly Blender). Another example of Canonical's extractive approach to the Linux ecosystem (IMO).