I did a client called Gnucleus back in the day, the original website is still up at https://gnucleus.org/ I also designed GWebCache with a friend in college (also the IRC caching before that was me, I'm sorry). I think in the end the cost/benefit of the Gnutella architecture wasn't there. Especially in privacy - too much of a liability exposing your machine to serve files and route traffic. Also the efficiency of search over the Gnutella architecture - your query never hit all the peers.
BitTorrent was designed with the good parts like decentralized file transfer, and ditched the decentralized search - simplified with a centralized website/tracker model that can also be members only. That helped people stay more under the radar, as well as allow people to jump on/off to get what they want.
Ultimately the better balance which is why BitTorrent is still going strong today, but there is some nostalgia for the craziness of a single global network. Where people can freely share all their stuff, and downloading/opening files was like rolling the dice.
I’ve been using the same OneNote for like 20 years now. It is backed up, synced and available no matter what device I’m on. Hundreds of lists, notes, references, thoughts, all fully searchable and quick to access.
It's an unsettling feeling as what's more complicated - all the atoms and galaxies, trillions of life forms, the unimaginable distances of our universe OR a relatively simple world model that is our conscious experience and nothing else.
I also did a private decentralized system that was like WASTE+DHT around 2009 (https://github.com/swax/DeOps)