A leaked slide from Sony’s internal presentation has revealed the Steam sales for all of its ports that have hit PC over the past couple of years. Do note, though, that this slide is from February 2023. As such, it does not have any sales numbers for The Last of Us Part I.
Demon’s Souls is owned by PlayStation. They made Dark Souls as a series because Demon’s Souls wasn’t something they owned. I believe the dispute goes back that far.
That didn’t seem like a dispute so much as it was recognizing an opportunity to make more money by going multiplatform. Then after Dark Souls became a hit, Sony seemingly contracted them to do something just like it again, and then it appeared that something went wrong on that deal. This is just based off of how it looks from the outside world, combined with the above rumors. I didn’t hear anything about soured relationships from the deal with Demon’s Souls.