Owner site should be always online, so that it fetches, what update is done, also index file should be changed accordingly. The goal of zeronet should be decrease the cost by distributing files. If keeping the owner site always online solves this problem, its ok. Also owner can create its own search index . If owner doesn't want to host the site, others can download the complete site, edit and host. All sites, its algorithm should be completely open source and also the data in it.