I agree that analogies are useful to illustrate (in some scenarios), but I would not use them to support my argument (outside of a discrete math course).

If I were to argue that Apple's app store policies were harmful, then I would do just that. I would define terms, define the parties involved, show the harm and to which parties, maybe provide some examples, show which laws it violates, and maybe suggest solutions.

But I don't see why involving Cheerios at a brick and mortar retail store would help clear anything up.