Why are some videos only 1/3 of screen size?

Showing my innocence here.
[media=https://www.youtube.com/watch?v=zvwM0DWYFOg]

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I think youtube has a cropping facility on their video editot, Gus.

Gusman · 61-69, M

@EugenieLaBorgia Thank you. Seems a strange thing to do🤔

@Gusman They probably want to be 'one of the cool kids'! There may be other reasons...not sure.