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I think it would be cool as a freebie to steamOS users. Would encourage people to try out installing steamOS to get the game for free.
Could either be that they just need to try it once to claim the game, or the game is free to play as long as they stay on Linux/steamOS to encourage them to use it long enough to finish the game.
Ars Technica is a pretty well respected tech news site, which is basically the only reason I considered sharing this to begin with. They cite that we know a new Half Life game is in development, and the critical role that half life played in the foundation of steam as a game platform in general.
Overall it’s a much better article than the title would otherwise suggest.