There is a demo video that shows a user wearing a Quest VR headset and asks the AI "what do you see" and it interprets everything around it. Then, "what goes well with these shorts"... You can see where this is going. Wearing headsets with AIs monitoring everything the users see and collecting even more data is becoming normalized. Imagine the private data harvesting capabilities of the internet but anywhere in the physical world. People need not even choose to wear a Meta headset, simply passing a user with a Meta headset in public will be enough to have private data collected. This will be the inevitable result of vision models improvements integrated into mobile VR/AR headsets.
He was clear in that one of their motivations is avoiding vendor lockin. He doesn't want Meta to be under the control of their competitors or other AI providers.
He also recognizes the value brought to his company by open sourcing products. Just look at React, PyTorch, and GraphQL. All industry standards, and all brought tremendous value to Facebook.