That doesn't really matter, though. A cloud provider would likely have different motives and apply a different calculus to the decision of whether or not to offer a refund in a case like this, than a restaurant would over a bottle of expensive wine.
Amazon is thinking about customer retention and growth, and about the goodwill lost in refusing such a request. The restaurant is thinking about the likelihood that someone is just trying to get out of paying for something for which they did actually understand the cost.