Top of this list used to be particular versions of Ubuntu
Summary: GNU/Linux "market share" in Steam grew by a quarter this past year, boosted by SteamOS perhaps, but watch the trends in distributions; even the Ubuntu-based distros aren't near the top (and SteamOS moved from Debian to Arch, so expect Ubuntu to stagnate further)
Judging by how the media totally ignored 800+ layoffs at IBM's Confluent and 400+ layoffs at Red Hat a few weeks ago don't expect to hear anything about Kyndryl layoffs