They became bilionare because of the exploitation. They have the bargain on their favor cuz they use their employees as objects of political exchanges to not be tax really hard by the government. They don't care about the people who who suffer from this savage system. they only want to increase the profit margin and have more power. the population suffer from private hospitals that are too expensive( in some countries) , the pharmacy lobby and speculation of real estate(who, because of this, have to live in peripheries).