A lot of people have a reaction like yours: This practice sucks and shouldn't happen! That means we don't actually need to make it illegal; since, as the blog

A lot of people have a reaction like yours: This practice sucks and shouldn't happen! That means we don't actually need to make it illegal; since, as the blog post linked in the grandparent notes, "it pisses the heck off of people," the free market will take care of it for us if we're patient. That blog post mentions specific multiple instances of companies that attempt egregious segmentation getting their lunch eaten by companies that don't. As I said, the whole article is worth reading.