While relays and file upload services are a simple and effective way to get started, I think p2p is the future.

Running a relay or file uploader is expensive, and you need content moderation. On the other hand, p2p is "free" because people are already paying for their own internet access and on-device storage, or even cloud storage. P2p is also much more censorship resistant.

Video hosting is so expensive that I imagine it will be the first thing to be moved onto bittorrent. If you don't like torrenting with random people, you could connect to people in your Nostr social network.

When Nostr becomes popular and free relays dwindle, maybe p2p becomes more common for event sync as well. Direct connections are also better for DM privacy.

If bittorrent is too clunky for general-purpose file sharing, we can devise our own file sharing on Nostr. Nostr is already based on content-addressed events. Just need a binary format and some standard for file chunking.