I absolutely agree, but I don't think it would be all that difficult to have a network of peers judge the reputation of a node. Yes, it would be possible for in

I absolutely agree, but I don't think it would be all that difficult to have a network of peers judge the reputation of a node. Yes, it would be possible for individuals to inject bad information, but unless they can compromise an extensive portion of the network, that information would be overridden by that of legitimate nodes. Then all you have to do is make it so that it would cost more to compromise the network than you would gain by compromising it. If bitcoin can use a peer-to-peer system to come to a consensus on the validity of financial transactions, it should be possible for a peer-to-peer cloud storage system to come to a consensus on how reliable a node is, and how valuable it is to the network.