They are building hype. And also, to make people want to see the movie. Nobody would buy tickets to go see a movie they know everything about. Think about it. Let’s say you’re a kid awaiting your birthday. Your parents tell you exactly what you will get for your birthday. The day comes, you won’t have that initial “Wow” of receiving a gift. It will be like going to the store to get your usual groceries. No wow there at all.
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