None of the OtherStuff has enough users to keep the nodes up (yet). I'm hoping to get institutional customers that only need to maintain their own node-network, but the social feed is the strongest pan-network use case. We need that use case hopping to keep Internostr exchange up, so that the Intranostr npubs can use the external nodes to hop from one Intranostr to another, smoothly and without being conspicuous, and to occasionally join the Internostr conversations. Otherwise, you end up disjointed islands and the value proposition melts. Communication networks should be noisy and busy.

I understand that. It very well might work the other way around where the islands realize they would benefit in having notes from other islands. e.g. you have a zapstore with it's own relays and want to talk about apps (or specific app) and that app has it's own relays where people use all kind of notes. both will benefit with publishing to each other's relays.