People say that porn was what made VHS popular, but that was a secondary effect. Relatively cheap tech licensing meant there were more (and more affordable) VHS compatible devices out there, which got the content ball rolling (both published and home-movie content) with a fair chunk of initial momentum.

Vision Pro does nothing unique for them to license in that way – if VR video content is what someone wants a device like this for, they will use it to view existing VR video content that already plays on other devices.