Isn't the problem of censorship much more than technical? I mean, censorship doesn't seem like something everybody agrees is bad. Free speech is not absolute at all : there is a demand to regulate, prohibit and prosecute for instance pornography, defamation, so-called "hate speech", "disinformation" and so-on.

Whether we agree with these policies or not, the fact remains that these impediments to free speech can be seen as a form of censorship. At the end of the day, I think what makes censorship acceptable is very much subjective, and tied to political beliefs. I can't help noticing for instance that on this github page, there are a few flags illustrating "censoring regimes", and the Russian one is there, but not the European Union one, even though the European Council blocked RT and Sputnik throughout the whole EU after the Russian special military operations in Ukraine. This blocking, regardless of what one can think of its legitimacy, is hard not to consider as censorship. If it's not, how is it called then?