They have to do it like this:

- emule like dht.

- keep a cache of 1000 of ips that had trustworthy content in different ip neighbourhoods.

- provide a pub-sub of new content + hot/top files.

- seed one-to-download one file. Host encrypted content, freenet style to have faster speeds on other files. Never allowing a file to go seedless.

- the software could be provided as a chrome+firefox sandboxed addon or something like that.

Go hackers go.