Yep, it can be an IPFS, a torrent link, or any other hash-based decentralized data storage. As long as anyone can rebroadcast the file to other places and clients can just automatically find that new server, it should be fine.
Isn't that NIP-94?
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Is there a way to allow any arbitrary person to extend the content with multiple urls? Is it trivial to index the events by sha?
I believe yes and yes.