I don’t know why, but openSUSE has had difficulty garnering popularity overall (aside from Germany).

A possible explanation, which also ties in to Fedora, is how both are the open source variants to corporate distros; SEL and RHEL respectively.

Arch and Debian are more community-driven by comparison.

For Fedora specifically, people couldn’t regard it as anything but a testing bed distro; especially if you see how back2back they were with adopting new technologies like PulseAudio, systemd, Wayland, GTK 3/4, PipeWire etc. To be fair, openSUSE was the first to default to Btrfs and auto-snapshotting with Snapper*. Fedora was also facing competition from industry darling CentOS; similar code base, but a lot more stable.

Thankfully, since a couple of years now, Fedora has recognized that it’s not cool to expect your user base to be sadistic. And together with the (unfortunate) downfall of CentOS, Manjaro and Ubuntu - Fedora has amassed a very healthy user base. And with how quickly Bazzite is becoming the face of gaming Linux (at least until Valve releases SteamOS), I don’t think it has even peaked yet.