I mean, obliviously.
Simultaneously created a game with Sony which the company financed a good part of the project. (Marketing, IP properties, development), while leaving "carte blanche" (depending of the budget I suppose) the strategic choices of the game (Art, Gameplay)..
If the game reaches a certain target sales level, then Sony can enter into negotiations for a buyout of the studio if they wish.
This is how Sony works. For Suckers Punch, for Insomniac Games, for Housmarque, for Bluepoint and for many of them... and sometimes, somes games was bad or poor succes (Sumo digital for Sackboy or Lucid Games for Destruction AllStar, or older, like The Order)
The only big question mark is still Haven Studio and Firewalker (GaaS game).
Microsoft buys studio whitout working with them. But Sony some of the purchased can be questionable (Bungie, Haven, Firewalker).
The next studio(Ballistic Moon Studios) will be depending of the succes of Until Dawn Remaster and it's successor. (Studio with many veterans of Supermassive Games)