1B: named-data networking, camlistore, ipfs.io, bittorrent's web -- very easy to censor since all content is uniquely identified by a hash
1C: ?
1D: Usenet, Wikipedia, Wikidata
1E: technically difficult, see history of YaCY and http://juretriglav.si/an-open-distributed-search-engine-for-...
2: Wikipedia, but content is rejected under arcane citation policy
3: Wikipedia, but content is rejected under arcane citation policy
4: http://ipfs.io & https://crowdprocess.com/
5. blockchain publishing
6. standard challenge of bootstrapping user-generated content in any new online network
The role and funding of libraries have changed over time and across cultures, e.g. being associated with cities or nations, being associated with universities and churches. Current libraries are struggling to retain access to book stacks, e.g. look at the history of the successful community fight to prevent the flagship NYC library from removing many of its books.