To me it sounds like they are simply taking social moon shots. They tried to do a phone, tried to make a kitchen videophone, tried to make their own cryptocurrency, and tried to dominate open source AI, and now this is trying to make something like a digital robotic assistant. It might have reached a peak with the metaverse, when Zuck thought his corporation was destined to be the ruler of a Snow Crash style metaverse, to the point of renaming it. Maybe that's still the plan and they are looking for something that will lead to another metaverse play.