Sony
Data miners have discovered hints that PlayStation trophies might make their way to the PC in the future. These trophies are a way for Sony gamers to track their achievements on the console. Crossplay is becoming a bigger part of the gaming landscape, and Microsoft extended crossovers to its achievement system. Sony might want to offer something similar for its users.
The first hint is when Marvel's Spider-Man Remastered added PSN support for the PC. Modders discovered that support could be extended to all PlayStation Studios games. After that, a scanner discovered a new trophy list with the platform category "PSPC." It isn't attached to a specific game, but it looks like a test list of some sort. Digging into it showed that PSPC is separate from PS5, but there might be some form of integration there. For now, these are all just rumours.