Because that would require everyone to have the zeronet client installed before they can go to the zeronet website to download the client...
Like bittorrent, zeronet requires a client. The client acts as local server and displays the pages in your browser
That explains it, thank you.
ZeroNet client has hosted on itself"s network,You can keep it updated without outside net.the site is own by zeronet's DEV:nofish.the update site is sync with github's project,the site is:http://127.0.0.1:43110/zeroupdate.bit