Ultramarine Linux was created out of frustration with the legal limits of Fedora. As Fedora (and Red Hat) is an American entity, there are legal restrictions on what software can be packaged in the distribution due to the US patent system.
The Ultramarine team aims to make Fedora a little more user-friendly by allowing users to install or package any software they want as long as someone maintains it in Flathub, RPMFusion, or Terra.
In addition to this, we provide various UX improvements around the system, and in the future, custom apps.
In case anyone else was wondering what this is