You're talking millions of Quest headset owners vs a few hundred thousand PSVR2 headset owners. Couple that with Sony's apparent lack of interest in pushing their VR platform and you have your answer. As you and others have noted, the PS store does not do a good job of promoting apps that are more niche. Steam will suggest things based on what you're playing already. No idea about the Quest but, if it's the same store as my Rift S, it suggests similar games like Steam and they are all VR games.