"as the hypothetical Best Buy scenario implies; a big-box retail store could reasonably claim ignorance to the contents of a prepackaged product"
Large stores manage just about everything when it comes to products and placement within their stores, I suspect they have many safeguards in place to make sure they are not illegally distributing products. Even if they did I imagine their reaction would be the same as apple's if they found themselves in a similar situation.
Either Apple is at fault for not checking the licence of the software they were re-distributing, or the Robota didn't provide the appropriate licence.
As far as reaching out to Apple users, why? They have little or no interest in technology, they want an appliance, not software. I doubt they would understand, or even care, about the difference between free and free. Apple appliances are designed to be closed, they are designed to serve content provides, not their owners. We should not help promote these products by providing software for them.