Agreed that relays and Blossom servers are both just hash-indexed stores; which is exactly why the meaningful difference isn’t storage, it’s the interface.
Blossom exposes blobs as plain HTTPS URLs that any browser, CDN, or <img> tag can fetch, while relay data requires a websocket, REQ filters, and Nostr-aware client code. My point was never durability… it’s that hash-addressed blobs over HTTP are accessible to the entire existing web, with trivial fallback across hosts since the path is the hash itself and can be mirrored across the web.
