Facebook purchased Oculus before they sold a single consumer unit. Any headset that wasn't sold by Facebook was a dev kit you had to apply for. (edit: looked up the original kickstarter, they did sell 6-7k dev kit units, which was mostly targeted towards game devs. After the KS the DK2 was sold on an application basis. The consumer versions that moved 10mm+ units were 2 years after Facebook's acquisition.)
I've clocked 10k+ hours with silly screens strapped to my head and I am deathly afraid of what Facebook has done and continues to do to the VR industry. The "metaverse" existed long before Zuckerberg set his sights on it, and he's already killing it.