For me, it’s the principle of bundling an experience of a product which does not require the tie into the other service. Think about it. You’re buying a product for a VR experience. If I’m not on FB now, what value does FB Add? None. Zero. And if it did then I’ll CHOOSE to sign up.
We should have the choice, not be forced into it just because they’ve bought the company. Just because FB invades your privacy doesn’t make it right. Other providers of this technology don’t need to play that game, or they allow you to opt in.