Ceph, GlusterFS, and I suspect SeaweedFS (but I haven’t used it) expect high speed, low latency connections to their peers. So they won’t work well over the internet.
There’s some info floating around about using IPFS as the backend for Jellyfin, which in theory should allow you to share media between friends, but I haven’t tried it.
There’s an old saying, “Unix is user friendly, it’s just fussy about it’s friends.”