It does not. It expands at every point in spacetime. This effect is quite literally negligible on all length scales smaller than far extra-galactic distances.

It does not. It expands at every point in spacetime. This effect is quite literally negligible on all length scales smaller than far extra-galactic distances. It is equivalent to asking why a car driving towards me does not turn blue due to doppler shifting. Except even more negligible than that.