This agent would also have knowledge of the user's habits and preferences, stored locally in your computer Who owns/controls "this agent"? If it is not the us

This agent would also have knowledge of the user's habits and preferences, stored locally in your computer Who owns/controls "this agent"? If it is not the user --- what incentive would this "agent" have to work in the user's interests? I would expect a Google owned "agent" to work for me similar to the way Google does now --- in a superficial manner that prioritizes Google's interests. Expecting otherwise would be incredibly naive.