This will create a market for storage and delivery of media. The p2p fallback option (loading the media as a torrent, or from IPFS/something else) is always there, but I imagine most use cases would benefit from a CDN if nostr is going to compete against the UX of centralized apps. I like the idea of having a fast CDN to serve media (and possibly provided a revenue model for apps the want to act as paid media hosts) while also keeping copies of the signed torrent metadata on relays as an anti-censorship mechanism, and to prevent lock-in to any particular media host.