Apple has a tradition where they release a 12 Days of Gifts app then each day around Christmas they give people a free version of some paid content - apps, music, books, or videos. You'd think people would be grateful.
Many people are grateful, presumably. However, there is an increasing number of people that are leaving one star reviews on apps, movies, etc. if the free content of the day isn't an app they personally wanted. Angry people leaving one star on a children's game because they don't play it sounds absurd, but sadly, is a reality.