Marvel Guardians of the Galaxy: The Universal Weapon - Collection Rewards

Marvel Guardians of the Galaxy: The Universal Weapon - Collection Rewards - Top view of various multicolored toys for fight arranged on pink background as representation of game

What is the deal with the rewards for completing collections? Whenever you reach a certain step (25%, 50%, 75%, 100%) of a collection you see the info window showing a reward (crystals in different color and size). But even if I complete a collection I never receive anything. What's the point in collecting all items then?

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Images: Anna Shvets, Allan Rodrigo, Andrey Karpov, EKATERINA BOLOVTSOVA