Most iOS apps don’t require using a camera. There’s a clear line between what is part of the product’s core functionality and isn’t, and if anyone crosses it, it’d be a pretty clear violation.
Instagram does have access to the camera and they’re showing plenty of ads. They’re the perfect use case for misusing a technology like this but they don’t.
Does that mean they wouldn’t do it on the Apple Vision Pro? No, but I think it means companies deserve the benefit of the doubt.
Vision has many things you could do because input on the platform is fundamentally sight-driven. We came up with a lot of interactions that Apple’s API frustratingly killed. In hindsight good: we got an ask to track what products people were looking at, and I could say no, Apple doesn’t allow it.