‘Serving sizes’ are absolute nonsense. They are always wildly out of step with reality. Only reason they put it on there is so manufacturers can claim “our product isn’t bad, it only contains X calories per serving”.
Meanwhile, they put serving sizes fit for ants on packages that clearly aren’t meant to be shared and don’t reflect reasonable consumption. For example, a serving size of three jelly beans is silly by any stretch of the imagination. So is putting ‘serving sizes’ on a soda can. And a sleeve of Oreos? One cookie is a serving. Yeah, we all know that’s not how you eat Oreos…