Sony wants to bring more first-party games to PC
Sony has said in a 2020 corporate report that it plans to bring more first-party games to the PC in the future. This is a decision taken after the success of Horizon Zero Dawn on PC, a game which was a PS4 exclusive for a few years.
"We will explore expanding our 1st party titles to the PC platform," the report stated, "in order to promote further growth in our profitability." The decision to bring more of the Sony in-house catalog to the PC is a key strategic point to the coming direction of its future Game & Network services division.
Soon, expect more Playstation games on the PC
The reason for the change is somewhat given in the report: "Competition from online PC games and players from other industries is expected to continue to intensify."
to summarize, Sony wants to bring games to the PC because that's where a large segment of the game-buying audience already is—presumably Sony is convinced they'll stay there.
The statement comes following the releases of Death Stranding and Horizon Zero Dawn on PC. Both games were PS4 exclusives released much earlier on the console, and per Sony's previous statements that's likely to happen more: Delayed releases on PC of PlayStation console exclusives.
No first party PS5 exclusives have been announced for PC to date, though a several third party exclusives have been. Microsoft has announced both first and third party Xbox Series X exclusives for PC.
This does not mean that Playstation exclusives will be put to an end. The Playstation Studios was founded for the very purpose of bringing high quality gaming experiences to Sony consoles.