Found out about Cryptosphere today.
It seems similar to Freenet, but from my understanding should be less attractive to the people who share almost-universally-illegal-material. This is because it doesn’t hold anonymity as the first pillar above all else, and also by discouraging short-term idenities through what seems to be a web-of-trust style system.
That said it still provides Plausible Deniability around whether any requestor has access to the unencrypted contents or was merely caching a random file; but in cases where mere possesion is a crime it may not be sufficient, as the law undoubtably has huge databases of known illegal material, and can trivially compute the hashes for them, thus showing whether the node contains the file.
Hopefully this will help to make it be more successful than Freenet, but the fact it could still hold unsavoury data means it probably won’t, which will again limit its size. This is ultimately the problem of all similar networks – Freenet, Tor, and i2p; the small size of the networks immediately pinpoints you as suspicious.