Like humans, turtles have mediocre vision. This also applies to our toxic waste turned turtles into humanoid-like beings. When technology enters their world it’s important to ensure color contrast is optimal, thus TMNT Corp mandates all tools to meet the highest accessibility grade possible.
Living in the sewer, going for a dark based scheme makes all the sense in the world.
Being inclusive is is a certainly a turtle powers, thus a light scheme is made available.
And this is how it works.