You'll be surprised, but it's RedHat that made most of that happen. A lot of the important Linux projects are developed mostly by them - Gnome, Wayland, NetworkManager, Pipewire, flatpak, etc.
Ubuntu, on the other hand, seem to like to do many things their way. Like aggressive patching. I recall fontconfig being heavily patched from upstream. Then we have Mir (now almost abandoned), Unity (abandoned), snap (flatpak, done differently, not yet abandoned :).
Ubuntu, on the other hand, seem to like to do many things their way. Like aggressive patching. I recall fontconfig being heavily patched from upstream. Then we have Mir (now almost abandoned), Unity (abandoned), snap (flatpak, done differently, not yet abandoned :).