Oh I’m sure they do. I’m sure Facebook cares deeply about your data and they absolutely would not ever lose it or accidentally give it away.
They definitely don’t see the VR devices as a gateway to another frontier on data collection. That’s why they paid billions for Oculus and then spent billions to sell the Quest devices at a loss.
Ignore the fact that one of basic features of the Quest is to scan your room and build a play area. Just give FB a burner account and you’re set they definitely won’t be able to tie that data together it’s not like they built their entire business around doing that.