That's... surprising. GNOME and Nix has very contrasting philosophies.

Anyways, Hyprland is primarily driven by the Arch side of things, considering that:

* there are way more Arch users than Nix users

* Arch is much more trendy amongst non-developer/Linux users.

* Arch is easier to setup and use - less friction

* Arch is more popular in the unixporn reddit/YouTube world, which is where Hyprland gained much of its popularity

* the Hyprland developer uses Arch, and has recently started selling customized dot files, advertised as "supported on Arch- based and Fedora distributions."

Nix users are simply not a driving force in the Linux userland world.