BitTorrent slaps so hard as a protocol, and DHTs are absolutely brilliant. With all of the recent hype about decentralization with the rise of crypto, I'm surprised BitTorrent hasn't seen much hype or revitalization as well.
Now that I think about it, BitTorrent is the best example of how well decentralisation can work, and basically the only reason I believe that a decentralised web is possible.
Unfortunately BitTorrent is still heavily centralized when it comes to discoverability. Without a website hosting .torrent files or magnet links, it's very limited.
There's always tribler