The hard part is incentivizing the maintenance and upkeep of multiple different open networks.

An admin needs to run a nostr node, a simplex node, and some other node? All on different networks with their own costs involved.

Or an admin can just run a nostr node and let it be a generic dumb pipe for everything, incentivized with just one economy instead of 3+ nostr:note1x55nr2um7jgykkh5qle3jazjm0s5helcjqcl5dqqsadhgxj7syfs9pcg26