The full article that was hinted at in interviews last week.
There are likely a few reasons behind this shift. One is that several recent PlayStation games have not sold well on PC.
Interesting...
But the strategy has been muddled and confused many players. Most PC releases arrived months or years after the games came to PlayStation. The cadence was never consistent, and the announcements appeared to be haphazard. The company also upset PC players by asking them to create PlayStation Network accounts to access many of the games.
I love Horizon: Zero Dawn. I have not played Horizon: Forbidden West. By the time it came to PC, Sony started making PSN logins necessary to even authenticate the game in the first place, which is basically just the worst kind of DRM. They've reverted this policy, but now I don't trust them. They put out a handful of games on GOG where I don't have to trust them, and I'll probably still pick a few of those up one day, but Forbidden West isn't there. Seems to me that they have no idea how badly they screwed up this rollout themselves. Oh, Uncharted 4 didn't do too well on PC? Where are the PC versions of Uncharted 1-3? Where can I play the original God of War trilogy? I'm not buying a PlayStation no matter how many exclusives you lock up there, so I'll just continue to not play your handful of exclusives.
Anyway, that's my two cents.
I don't know the exact contract between these two companies, but often times a publisher like Sony will own the title/world/story and the developer will own the code. Sony is within their legal rights to make a remake of Demon's Souls (also a Sony exclusive from back in the day), but it seems to have upset FromSoft, and when FromSoft is putting out bangers like Elden Ring, you don't want them to find a reason to not put their games on your console. Other than Demon's Souls and Bloodborne, every other modern FromSoft game has a different publisher, whether it's Bandai-Namco or Activision.