Actually, this doesn't work. There's a specific court doctrine called the State Actors Rule. If a private entity is working on behalf of the government, then all of the constitutional protections applied to the government also apply to that private entity within the scope of them being a state actor. For example, this is why it is unconstitutional for Donald Trump to block you on Twitter, or for the Air Force's esports team to block you from their Twitch streams. This also extends to physical venues and company towns.