> Congress makes the laws that allow corporations to operate nationally. It can be argued that Congress has abridged the freedoms of speech, the press, and assembly by creating the environment in which private entities own everything that resembles a modern public venue.

Only if by "it can be argued" you're referring to being physically capable of arguing. Otherwise, no. The first amendment was never about guaranteeing you a platform or about otherwise ensuring anyone else hears you. It was about the government not arresting you for what comes out of your mouth.