I think I remember that nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft has used holepunch for some of his experiments, what I remember from him is that it's all not very stable. We tried using keet for gossip dev meetings but it failed many times to get us all in one chat.