They're not dictating your business model. They're dictating the rules of distributing on their platform, which they built.
If there are competent employees that are not finding good jobs because they are not on GH/LI, then that is a market opportunity for people to start hiring people who explicitly don't have those things.
The idea being that since it was "economically irrational" to discriminate on the basis of skin color, the "free market" could therefore take care of it, therefore legislation was unnecessary.
Actually yes they are because they control approximately 100% of distribution.