I don't think there's an easy answer. 2 possible solutions:
(1) deplatforming could be either a democratic process, or be challengeable through some kind of democratic process.
(2) deplatforming could be at the sole discretion of platforms, but the platforms themselves need to use open standards and protocols such that it is sufficiently easy for those who were deplatformed to switch to the opposition or self-platform (for example: ios allowing competing app stores). This would be difficult and technically challenging to enact in many situations (what does it mean in the case of social networks for example?), And if there's no competition we need antitrust ASAP
If all the competition are also deplatforming you, I think at a certain point it becomes fair to say that you were more or less democratically rejected, much like if every bar in town kicks out neo-nazis that's not a failure of free speech but a success of the free market. But that relies on a large, healthy, robust competitive ecosystem which does not exist in a billionaire-dominated tech scene.
(1) deplatforming could be either a democratic process, or be challengeable through some kind of democratic process.
(2) deplatforming could be at the sole discretion of platforms, but the platforms themselves need to use open standards and protocols such that it is sufficiently easy for those who were deplatformed to switch to the opposition or self-platform (for example: ios allowing competing app stores). This would be difficult and technically challenging to enact in many situations (what does it mean in the case of social networks for example?), And if there's no competition we need antitrust ASAP
If all the competition are also deplatforming you, I think at a certain point it becomes fair to say that you were more or less democratically rejected, much like if every bar in town kicks out neo-nazis that's not a failure of free speech but a success of the free market. But that relies on a large, healthy, robust competitive ecosystem which does not exist in a billionaire-dominated tech scene.