You're thinking too small. By owning a Quest 2, you're signalling that you (or your parents) have disposable income they are willing to spend on electronic devices. Yes, it clearly shows you're a gamer. So if you're a gamer, you probably drink Mountain Dew and eat Doritos. Based on your FB profile, you probably like certain types of shoes. 75% of other people with matching criteria purchased something, so let's shove that in your face as well to see if we can't get it up to 80%. Oh, you play games between the hours of xxx, so you must be a teenager. Let's target ads to get your parents money.

That info seems like table stakes for Facebook. It doesn’t take the many billions invested in Oculus to find any of that out.

Sure if that was the only data point. however, this is just one more thing they will use to refine the data they are sucking in about you every second. At this point, why would they not do it? It's in their DNA.