Interesting. I was wondering if the orange/blue thing was going to extend to posters, and it looks like it does. For reference: https://priceonomics.com/why-every-movie-looks-sort-of-orang...
I thought there was a clear smoking gun reason it has become popular but it doesn't seem entirely clear cut. Except that the blue/teal makes orange (and skin) "pop" as the colors are complementary, and color swapping/enhancing has become much easier in recent years. (And I think, somewhat cynically, because both hues are both pretty far from the default green screen color...)
A natural reason teal and orange works - it's generally understood that the most flatteing lighting is at golden hour, when the sun sets but is still very bright. The sun takes on a more reddish hue (going to orange) and the sky tends towards teal. The stricking image of a sunset you can picture in your head.
In real life the cokor of both the sun and sky will strongly affect the color of what you see, meaning you actually see more "teal and orange" at that time, although much less intense than when color graded ( and you're losing light, so you're not used to bright teal and orange).
Unsubstantiated, but I also think your brain feels the manufactured lighting (which is flatteing to the skin) is similar to golden hour, and that then the teal and orange can make it "make sense" more, unconsciously.
Look out for sparks as well. There was a period when everything had sparks. It seems to have calmed down a bit but you still see it on action posters. Orange and teal is fascinating. Once you know it's a thing, you can't unsee it. Especially when the set dressers are in on it and characters have orange and teal books, light fittings and clutter.
https://www.theshiznit.co.uk/feature/how-to-design-a-hollywo...
Orange and blue are complimentary in subtractive color which explains why this combination is everywhere. Just like red/green and yellow/purple.
https://en.wikipedia.org/wiki/Complementary_colors