It is an aesthetic choice. Not one I would make, but it is one. By drenching everything in one monchrome color gradient it is also easier to hide bad set desig

It is an aesthetic choice. Not one I would make, but it is one. By drenching everything in one monchrome color gradient it is also easier to hide bad set design, costume and VFX. Doing a crystal clear shot with a steady camera, full color and a believeable effect is much harder to pull off (and thus: more expensive). Technically nothing speaks against doing any other style of lighting and coloration, but then you cannot hide behind the colors and then you have to think a bit more deeply about color schemes than "blue=calm/depressive" and red/orange=aggressive/dangerous". But Netflix is not in the business of producing motion pictures that are deep, Netflix wants to crank out as much content that people watch as possible, for the least budget possible.