I don't even know where to start here. Common carrier laws? The post office? Court cases forcing shopping malls and company towns to allow freedom of speech? I guess these are all innovations by the Textualist/Originalists you despise.
I remember that company towns had to allow private speech, but I never heard that shopping malls had to. I always thought that any protest or disruption or unpopular speech in a mall would get you escorted out by security.