I don't think market share is much relevant here. Small cell phone carriers can ban customer text message conversation based on political opinion, but not AT&T?

I don't think market share is much relevant here. Small cell phone carriers can ban customer text message conversation based on political opinion, but not AT&T? On page 8: > Why does the law preclude the companies from doing this—even when they’re not monopolies, such as landline companies might be, but are highly competitive cell phone providers?