Perhaps because Death Stranding is a game developed by Hideo Kojima and he owns the IP? Because the last time he had popular IP, Konami took it from him? Because he'd have to be a f***ing idiot to let that happen again?
Because the Death Stranding IP is actually owned by Hideo Kojima and Sony, in their publishing deal for PlayStation, just registered all the trademarks and copying so he could get on developing the game..
Crazy I know.. but seriously.
There is one convoluted process that might resolve conflicting thoughts on this.
First we have Kojima stating that he wants all games he produces to appear on multiple platforms and prior to Death Stranding being announce mentioning that his next game would appear on multiple platforms.
Then we have Sony trademarking the game implying that they might own the IP.
It's possible that in negotiations with Sony in exchange for allowing them ownership of the IP, Kojima stipulated that it must also ship on at the very least one other non-Playstation platform (PC in this case).
It could also be possible that if Sony do (or did) own the IP for Death Stranding that there is wording in the contract that stipulates that at some point after the launch of the game, ownership rights of the IP would either automatically pass back to Kojima or he would have the option to buy back the IP with Sony not being able to refuse such an offer as long as it exceeded X amount of currency.
Considering how ownership of IP that Kojima creates was one of the reasons he left Konami, it's hard to envisage him voluntarily giving up the IP of the very next game he creates after leaving Konami. But it may have been a situation where he was unable to raise enough capital to fund his next game and thus he was forced into a situation of having to negotiate ownership of the IP for his next game in order to secure funding from Sony for the production of the game.
So I guess, it'll be one of these situations.
- Sony permanently owns the Death Stranding IP.
- Sony temporarily owns the Death Stranding IP.
- Kojima Produtions owns the Death Stranding IP.
While Sony did release some smaller titles on PC under PlayStation Mobile (Helldivers and Everybody's Gone to the Rapture), it may be that for the first AAA title to get the PC treatment they were hands off. Basically with Kojima Studios handling the PC version of the game, perhaps Kojima Studios was thus also allowed to choose who would publish the PC version of Death Stranding despite Sony potentially owning the IP. This could also be part of the contract involving potential Sony IP ownership if Kojima did indeed allow Sony to have the IP to Death Stranding.
It's also possible that in said contract, there might be stipulations in place that all non-PlayStation profits for the game would go directly to Kojima Productions. Basically in order for Sony to have the rights to the IP they had to give up any non-PlayStation revenue for the game. At the time that may have been acceptable to Sony in order to secure the IP rights as they may not have had any AAA aspirations for PC back then (teaser for Kojima's next game after Konami was a quite a few years ago).
Basically a unique situation that's unlikely to come up again.
Regards,
SB