I wonder why that's okay for farmers to do? Let people believe that the color of the yolk is a tell for health and purchase eggs from companies they believe to

I wonder why that's okay for farmers to do? Let people believe that the color of the yolk is a tell for health and purchase eggs from companies they believe to have good eggs. (To my knowledge, just one example, a lot of the egg yolks I've seen from Japan are typically very orange and are said to be high quality). These farmers using color additives are in effect fooling customers and are presenting a product that isn't what it appears to be.