Developers/publishers (whoever owns the rights to a publish particular game) submit the game to Steam, and Steam decides whether or not to put it on the service. When they reject a game, their policy is to *not* give the reasons for it, so it's all a bit of a mystery. Good press coverage and awards can get their attention, but not always. They're pretty selective about what they'll take on the service.
I don't know anything about dtp's experiences with Steam specifically, but if they have tried to get their games up there and Steam has rejected them, that wouldn't surprise me at all.
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