So FB can take over the VR market by over-moderating FB, and making Oculus a requirement to get support. Looks very anti-competitive and illegal.
Intent matters a lot in law. Based on gp's description it definitely doesn't sound intentional, so it's probably fine from a legal point of view.
So, no risk of a Facebook monopoly here.
Facebook is also deep in bed with Qualcomm making Quest 2 work fully standalone and getting the XR2 SOC at a steep discount. Index and Reverb G2 require desktop PCs and high-end GPUs, and other companies using the same Qualcomm SOC have to pay full price.
Facebook making Oculus worse might be bad for customers, but it's great for Oculus' competition, ain't it?