>But if such a cost can save you hardware and server hosting, it's worth it.
The vast majority of this discussion is miles above my head, but this made my Spidey Sense tingle. Someone somewhere has to host the data, and seemingly in more than one place. There is no such thing as a free lunch.
Authenticity over P2P is complex, that's the cost of having no server. But if such a cost can save you hardware and server hosting, it's worth it.
> What advantages does that give over just hosting the internet over static torrents?
No need for DNS. That is pretty huge.