All Fedora variants come with only the Fedora flatpak repo enabled by default.

I understand the concept: have a curated repository with well tested, compatible and virus-free software for the users.

In practice, it’s not working well. Not enough maintainers, not enough time. There is already the RPM repo to maintain. I have recently faced issue with the flatpak for PrusaSlicer, being outdated and crashing from the Fedora repo.

If not enabled by default, Fedora should have flathub listed as a extra repo source and make it a one click to activate. Maybe it’s the case like that already? Last time I installed a fresh Fedora, I had to add flathub via the terminal. This was already a long while back.