I doubt it's color blindness. As others have mentioned this lack of color seems to be a more US based phenomenon. I think it's the logical result of the obsession with "gritty and real" that took off with things like "Bourne Identity" in 2002. The laziest and cheapest way to convey that "dark and drab" vibe is by just sucking all the colours out. Movies started getting to mimic Bourne and others like it because they were popular (and yes, like always Hollywood did zero actual investigation into why they're popular and just tried to copy surface level). That just kept spreading and now we're stuck with it