Then again, they published Dust: An Elysian Tale as well, and that one is on GOG, and Linux native on Humble (why isn't the Linux build on GOG yet?).
It and Mark of the Ninja have their respective developers listed as publishers though and were released here long after the Steam release.
True. The reason -if I recall correctly- of Microsoft being set as publisher (and their logo video on game start) for Dust was because it was first built for XBox 360 and every game on that platform that doesn't have a specific publisher (like most indies) get Microsoft. Then the video was for some reason kept through ports despite Microsoft having nothing to do with it beyond "publishing" solely on their own console. Still, having the Microsoft Studios logo flow in on a Linux-native game is ...interesting.