If you’re a person who lives in the world, then you’re probably already well aware that different government agencies do things differently from one another. Getting a new driver’s license in a new state after you move, for example, can be a significantly different process than what you’ve done before.
When you’re a vehicle manufacturer, different agencies each have their own registration requirements for the vehicles that you manufacture. In the case of the US National Highway Traffic Safety Administration, that model and VIN information—as directly reported by manufacturers—is made publicly available for interested parties to peruse at their leisure.