Unity High Quality Lighting Tutorial (Part 5) 

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This is a trend because in games, the ability to quickly identify priority targets/objects/goals is vital. High contrast and over-saturation make it easier to differentiate between objects. In a film, you can art direct and compose the image to guide the viewer's eye towards the appropriate subject. You can do this because the camera angle is planned out far in advance. In a game, the player could be trying to find your subject from any number of angles, and players need a LOT of guidance to find where they are supposed to go. Putting unnaturally bright lights is an easily understood way to direct the player.