The color green they use doesn’t occur often in the subject matter they shoot (film).
Modern Green screen works by keying on a specific color and then programmatically removing that color (I.e. making it transparent.)
Additionally, the color leaves an edge that blends well with whatever image they put behind the Green-Screened footage
So, they use that green because it’s rare. If they used, say a skin tone, then people would look partially transparent after the color-keying removal is done
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