How about distributed crawlers coupled with a distributed datastore similar to Freenet? Your browser automatically crawls the pages you visit and adds the info

How about distributed crawlers coupled with a distributed datastore similar to Freenet? Your browser automatically crawls the pages you visit and adds the info to the distributed index that is also stored on all participating machines (perhaps with a copy on the cloud for query performance). Though a single browser may visit only a few pages, we ought to get a pretty good WWW index from the combined crawling of millions of browsers. Main advantage would be resistance to censorship.