DHT is not a silver bullet.
Torrents get spam attacks, CJDNS routing tables have grown enough to require offloading the routing to dedicated nodes (this scaling problem inspired the creation of the Yggdrasil network, which our friend
@FIPS shares some similarities, namely the spanning tree routing algorithm), IPFS supposedly addresses the vulnerability issues but discoverability of “unpopular” content is slower than finding whatever most of the nodes are already hosting.
Bottom line is, resiliency is hard.