I think metaverse is their primary target in making it as well, as I mentioned in a sibling comment, but modeling an avatar then rendering it is probably the easiest computational way of generating a video, even if the video itself isn't volumetric. See: traditional 3D avatars already in meeting apps which use the video feed.
I'm not sure if there would be any other potential use cases beyond these two. Or rather, I'm not able to think of them at so far.
This is for the metaverse.