It's a community repository for Fedora. It works similar to RPMFusion: you can use it along the official repositories to grab software that's not available there. If you'd like to reduce the number of organizations you're directly depending on, you may choose to use their Fedora fork, with their own repositories (forked from Fedora's), called Ultramarine Linux [0].

[0]: https://ultramarine-linux.org/