Nah VR solves his browser problems. Sony Rootkit style access to the user's system, with VR drivers/launcher, Access to biometric data like eye/mouth tracking (users making their own), whatever you can fit on a fitness watch (advertising with heart rate and blood pressure biometrics), and of course camera access to the user's room.

Likewise I imagine it's soul draining to Zuck being told no by Apple. So they're probably obsessed with making their own walled garden.