That's not what censorship means. Actual censorship, which was seen in Eastern and Central Europe and some other places during communism meant that you're literally not allowed to say certain things. You'd be prosecuted by the government if someone reported you or the government found out in any way that you were spreading certain kind of "forbidden" ideas. It didn't matter where you said it, when you said it, to how many people you said it, and if you used your own platform to say it or someone else's. It was simply not allowed.
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.
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.