Ubuntu has fallen out of favour with quite a lot of Linux recommender sites and reviewers and its mainly about flatpak and Gnome, but also gaming support by default. Other Linux distributions do things better now for the influx of gamers to Linux and with SteamOS being on Arch a lot of Arch deriatives are becoming increasingly popular. I don't think its Fedora picking up users, its Cachyos and Bazzite.
