> Ubisoft and Epic have their own game stores inside of the playstation store?
No. Sony PlayStation is almost identical to the Apple App Store in that there’s only 1 way to get your software working on retail units.
In fact it’s a lot worse in many ways, you need two specific types of hardware to even develop software- Sony is quite old school and draconian when it comes to testing, validation and communication.
At Ubisoft we had entire teams of compliance testers for Sony/Microsoft- and if you ever tried to get content outside of their stores (ie; loading after the game launches) they are quite aggressive about pulling the game down.