As AI becomes an interface to more work, the most valuable layer is not just the public model. It is the private context around a person or organization: files, preferences, workflows, history, constraints, permissions, and environment.
Private AI is the trust layer of Everything Everywhere. If AI mediates memory, business, law, community work, spatial computing, and automation, privacy, ownership, permissioning, and local context are not side concerns. They are core system design.