I agree. Setting up mirrors would probably be a better fit for this kind of content, but mirrors would be susceptible to the same dangers that the primary website may face: forced take-down by the hosting provider, domain blocking, etc.

The fundamental difference of content-addressed networks is their resiliency in the face a single authority trying to track down all of the sources that have copies of the content.

Even though IPFS is still in its infancy, one of its primary goals is to solve the problem of content suddenly disappearing from the Internet.

Yes and no. You need servers that guarantee availability (but they could hide themselves pretty well if necessary). Then the torrents provide accessibility.