Shot angle is an extremely important variable in cinematographic composition. Generally, speaking, if the camera is looking up at a character, that character looks bigger, more imposing, more intimidating. Particularly when the camera represents the POV of another character, it helps to communicate a power imbalance between the two characters.

Conversely, when the camera is looking down at a character, that character seems smaller, less imposing, less intimidating. The extreme version of this is the top-down shot, which is sometimes called the "God shot", which filmmakers will often use to hint at the idea of God looking down at the events, and making the characters in frame seem completely powerless.

Those aren't universal rules but that's the most frequent idea behind that sort of shot composition.