If the rule is "take one" and someone takes everything, than a rule is in fact breached. In your example the candy bowl is explicitly marked as "take as much as you want" and someone does. If you don't want that, label it appropriately next year.

I'm this case, the license explicitly allows everyone to use the software for free. I don't understand your candy analogies. If you're not OK with people using your software for free, use a commercial license (or a dual licensing model, or one of a hundred possible solutions other than a free license).