What Americans call censorship is not that. Anyone who is banned from a particular platform still has freedom of speech. They can say whatever they want to whoever they want without the fear of government prosecution. If Twitter bans someone, it doesn't mean that the banned person can't speak somewhere else. Everyone has a right to moderate their private property which includes digital space. Although banned from Twitter and some other platforms, Trump didn't lose his freedom of speech. He can say whatever he wants. It's just that he will need an alternative way to reach a big audience because major companies specializing in providing big audiences don't want to provide him their services.