It's a mild surprise in an era when game developers frequently choose only one major store for PC releases (or accept timed exclusives), but it makes sense for a title like this. While Death Stranding is Kojima Productions' first game, it's a high-profile release from a legendary game designer -- Kojima and crew don't need the monetary perks that would come with a PC exclusive. This also ensures that as many people can play on PC as possible, whether or not they're 'loyal' to Steam.