Ubuntu has sizable market share in the Linux community. You can look no further than the Linux games available on Steam/GOG to see that many of them are offered

Ubuntu has sizable market share in the Linux community. You can look no further than the Linux games available on Steam/GOG to see that many of them are offered specifically for Ubuntu, not Linux. The fact that Canonical was switching to Mir was of great concern, particularly to gamers, who were worried that AMD or NVIDIA would start pushing Mir-only graphical/driver patches at the expense of Xorg/Wayland patches, resulting in gamers being "locked in" to Ubuntu.