If you cram every social interaction a network has in a massive common distributed store (which is what using a bittorrent like protocol would entail) you have every node requiring to consume gigabytes over gigabytes of content, despite being interested in a fraction of a fraction of it.
I don't know if nostr or scuttlebutt resolve this issue, but if they don't ... how do you imagine a mobile app for keeping in touch with your grandma, requiring gigabytes of data transfer and storage would work?
At this point people saying bittorrent is a solution for social networks are basically just the guys who know about hammers and seeing nothing but nails.