I think you have a very strange definition of censorship. Generally, people use "censorship" to refer to an organization with some kind of power relationship to a speaker preventing speech from being disseminated. Fediblock is not an organization, and the admins who use it do so specifically because they don't have power over the person speaking.

It's the equivalent of sending an e-mail to my neighborhood listserv saying "the guy who lives down the street is a bit of a dick, let's not invite him to the chili cook-off next time."