Any system that is that resistant to censorship will have to deal with it being used for files that the government most works to censor. That sort of relation

Any system that is that resistant to censorship will have to deal with it being used for files that the government most works to censor. That sort of relation will drive other people away and you'll find government increasing their power to be able to take it down (or at least identifying those who access it and take them down). Until society is willing to tolerate such material as the cost of a system that cannot be censored, the majority will continue to go for systems that give government the ability to censor what the people cannot tolerate, under the pinky promise that government won't use their powers for evil.