This uses DHTs. How resilient is it against Sybil attacks? Also how does it work under global netsplit conditions, like if someone borks or attacks BGP in such a way that 1/3 of the world is not reachable?
My impression is that DHTs fall down pretty hard under the latter scenario and are also pretty vulnerable to the Sybil scenario if the attacker has enough resources to mount a really serious attack. They're okay for low-value simple stuff that doesn't have much of an intrinsic bounty attached to it (like BitTorrent magnets), but trying to put a "decentralized web" on top of a DHT seems like a scenario where the instant it becomes popular it will get completely shredded for profit (spam, stealing Bitcoin, etc.).
My rule of thumb is that anything designed for serious or large scale use (in other words that might get popular) needs to be built to withstand either a "nation state level attacker" threat model or a "Zerg rush of hundreds of thousands of profit motivated black hats" threat model. The Internet today is a war zone because today you can make money and gain power (e.g. by influencing elections) by messing with it.