I don't think people properly realize just how much Sony did actually invest in the PC market. Consider that we now know that they had essentially changed the course of almost ALL of their studios to pivot to GaaS games, which we can assume were all essentially either planned to, or at the very least rumored to launch on PC day and date with PS5. Obviously they've shifted their plans a bit and backed off of a huge number of them since then.. but when you realize just how hard Sony actually was trying to pivot their studios, it becomes clear. Almost all of them had these types of games in development. Hell, Naughty Dog even made an news article on their website about how they were integrating PC development into their studio culture and how it would ready them for future multiplatform development. We know that Sony Bend did the port of Days Gone internally, and a lot of these studios are capable of simultaneous multiplatform development.
I maintain that these single player game ports, which cost essentially nothing and are almost guaranteed to make them money over long periods of time, are being done to "get the catalog" onto PC to give them enough content to launch their own store and bring PS+ to PC, and then eventually go day and date and put more grunt behind the platform upfront.
