I think the relevant use case for this are places like Russia (one is even quoted in the testimonials) where I've seen concern about the country isolating itself from the outside internet, due to the various regional tests actually trialling this.

I've seen such users ask about ways to prepare storing outside data in the event it becomes permanent. Some have suggested mesh networks, others downloading Wikipedia and torrenting things.

So it seems that this is useful where internet is still available but is restricted at say the ISP level. It seems to be a browser that when a page is unavailable it checks for Ceno torrents of the page from other users and serves that instead.