Scionic Merkle DAGs are actually much better than IPFS Merkle DAGs.
Plus, IPFS focuses on a P2P model that forces everyone to become a server — whereas Nostr is a user-server model with paid servers.
Specifically, Scionic Merkle DAGs have much smaller branches with far fewer useless hashes needed to create the same proof. It scales logarithmically, see stats below: https://github.com/HORNET-Storage/scionic-merkletree 