The very fact that Parler was banned by Big Tech and not by US Congress puts a very bad light on America. Why would any Government trust American Government's word if a Private Company can undo it or act unilaterally without Congress approval? What does it convey to the World leaders? Is there 1 power center in America or 2? We used to mock Pakistan for having dual power centers (the elected Government and the military since their military doesn't come under the control of the elected Government). It caused a lot of confusion for World powers to interact with Pakistan as no one knew who the controller was. Was it the elected Government or the military? I'm seeing the same thing happening in America. Why should my Government take US Government seriously if a private company can ban/censor US Government communications?
Deleting a sitting US President's account is not going to be respected by any Government. Period.