mrkgnao: Curious discount, considering that the game has been 50% off on Steam several times in the past few months, most recently just 8 days ago.
MegisED: From past reports it seems Steam has mandates that dictate it can't be cheaper on other platforms, which includes sales, or games would face getting kicked off the platform.
I'm pretty sure that's not a thing. What you're probably thinking of is the stipulation that devs & publishers can't sell Steam keys of their games through other sites cheaper than on Steam itself. (I'm also not sure that
that's true, but it least it seems believable.) There have been plenty of cases where non-Steam copies were sold for less than on Steam. Right off the top of my head, the old adventure game
Dragonsphere was released on Steam as a paid game after having been free on GOG ever since it released here. It then
remained free here for another couple years or so until GOG's original contract to distribute it expired. There are also cases of games on GOG, itch,
et al. being priced less because they're missing multiplayer, or simply because the developer wanted to promote people buying on that platform.
I would guess that any such conditions as restrictive as "You can't sell the game anywhere else for less than here" are going to 1) be imposed on a case-by-case basis, and 2) have been arrived at after some negotiation, same as with any kind of artificial store exclusivity.