Perhaps they're just marketing it with what's available. The scope of VR games are pretty limited at the moment, and because VR headsets aren't exactly ubiquitous, I can see why the work that's being done is mostly done by enthusiasts. I personally have only really spent a decent amount with two games, Resonite and Dungeons of Eternity. One is a creative platform, honestly more of a game engine than a game, and the other's an actual game.

I don't really care about what Facebook did for the market, because ultimately they're an evil company and I'd rather not have anything else to do with them. I get a gross feeling every time I put on my headset because I know that they're sending as much data as they can back to their servers. I'd be more surprised if you could prove that they don't have a complete 3D scan of my flat, including images, than if you told me they did.

Valve at least goes with FOSS, and builds on top of that. I won't need to seek Facebook's approval to install software on a device I paid for. That's the very minimum I should expect as a consumer. Facebook doesn't meet that expectation by a long shot.