would be cool if they and rumble added blossom

Odysee's bittorrent protocol is more scalable in this case, it achieves persistence for content by ensuring users also host it, via P2P. Blossom still requires dedicated servers and to my knowledge has no chunk-based fetching from different sources. Odysee essentially overcame this the same way BitTorrent works, by making every client app a server - You stream the video, then hold it for x amount of time locally, and seed that video back to other watchers in the background. Only way for Nostr to do the same, would be to have clients host a local relay (which some do, although there used to be more chatter and development about this a couple years ago) AND a Blossom server also, and you'd need to be able to fetch chunks from different sources, which I don't believe Blossom can do.