>This doesn't apply to people or busineeses making their own rules
It didn't apply to states either. Yet it now does. When something gets large and powerful enough it becomes a government regardless of how you try and spin it.
What about grocery stores? What if they declare that they won't sell you anything because your viewpoint is different from theirs? Surely groceries are not common carriers?
1st amendment
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, ...
This doesn't apply to people or busineeses making their own rules