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)
To Microsoft, what's left of GitHub after dismantling/folding it is some "training set" (people's code, without permission to "train" i.e. misuse under the guise of "GenAI" plagiarism)
By conservative estimates, and based on court documents submitted by them, they're prepared to spend over a million dollars on lawyers, fighting against me and my wife