There's no conspiracy. It's Maltodextrin.
From Wiki answers: The white powder is Maltodextrin, which is a polysaccharide that is used as a food additive. It is mainly used as a thickening agent, which helps to thicken the cheese in the Easy Mac bowl.
Basically because you're not going to put milk or margerine into the noodles to act as a binding agent for the cheese powder, this provides something to turn that cheese into creamy goodness. Otherwise you'd end up with cheese that won't stick to the noodles properly.
The reason why they put it in the bowl and not in the cheese itself is that it needs to be activated with water first.