I would argue that Facebook are not the stewards of the first big VR world, Linden Labs are. Second Life has been a thing for a long time and, while not exactly the decentralised dream of an open metaverse we would want, its a hell of a lot more open and unregulated than whatever Zuckaberg's boffins could cook up in a month for the keynote scripted demo.

Now, I could sing the praises of Second Life (and parallel efforts like Open Simulation) for a long time, but it would be unfair of me not to mention that it is not officially a VR experience. All VR access to "The Grid", as they call it, is done through third party "Viewers" (effectively a web browser for the metaverse) based on the now open source code for the official Linden Viewer. That said, there has been serious efforts made into making a VR Viewer for The Grid, and I expect such efforts will only be enboldened by the new direction Facebook/Meta is taking.