ok, I don't know enough about ICP to comment on the first part.

Nostr is very different from Bittorrent, there is only the sharing of data on discovery.  You're pulling the actual data from 1 relay from my understanding of gossip's model

and notice you did not mention arweave's gateways,
nor did you mention cloudflare or the centralized internet.

So your answer is what? do nothing and more of the same? no thanks