Competition is the king of the castle.
Some people see libre software/open source as a product that must compete these days, even when there's no company behind...
At the end of the day, people use it because it's the best option, no matter what OS they use.
At least for day to day tasks (VLC, Kodi, OBS, Calibre, etc) and of course, emulators with frontends like RetroArch, Recalbox, Retropie, etc.