There's an enormous difference in business models between Sony's 1st party studios which leads me to believe they each get alot of freedom in how they operate.
ND and Polyphony are probably the worst, ND had MTX in their MP modes for like a decade and they're pretty egregious. Meanwhile you have games like God of War, Demons Souls, Returnal, Ratchet and Clank, Horizon Forbidden West, etc that either ship a complete game or put out free content with no post game monetization.
It's very possible that we'll never be able to identify a "Sony GaaS strategy" in terms of how the games are monetized because each studio will handle them so differently.
While this is definitely true now I don’t think this is an indication about how they will be proceeding in the future with their GAAS. A couple weeks ago during their future strategy call-thing, they outlined how they are setting up Bungie to co-run another internal division specifically focused on creating some sort of synergy between GAAS titles between studios.
It seems like they are aware that if they allow every studio to dictate their own terms or try and figure it out on their own that it’s going to be a lot more hassle then its worth. This was one of the primary reasons they bought Bungie.
GT7 seems like a cautionary tale for them right now as far as leaving it up to individual studios. A lot of their studios just don’t have the experience running live-service games as they are now.
After seeing how Avengers ended up it seems Sony is going to be creating as little fail states as possible for this new live service game initiative.
I’m sure they want at least a couple of them to be successful long term on the level of Fortnite, Warzone, or APEX