It is effectively uncensorable because the world is not 1 government, but 200 something. And no matter how much kicking and screaming the US does, not every country will comply.

It also uses the fact that the IPFS cache is also used to deliver content to others, similar to the way Bittorrent allows downloading and uploading based on blocks of content.

There still has to be someone hosting it initially to spread. But even that can be done over Tor, given the patches from OpenBazaar and IPFS.