They believe that the value-add of Facebook and Horizon will cause enough users to buy the new, cheaper headset vs the people who will not buy it. I don't know

They believe that the value-add of Facebook and Horizon will cause enough users to buy the new, cheaper headset vs the people who will not buy it. I don't know if they are right (I want the OASIS as much as anyone but not from Facebook, unfortunately), but people who use Facebook probably don't care all that much. And there's no way they'd make their new social VR space work without a Facebook account (they allowed that on Instagram and now seem to be trying to set up a bunch of interoperability stuff for things like Messenger).