There are only DHT peers that get the initial index of the network, but there’s tons of them. It’s literally the exact same as BitTorrent. After you have any touch point to the network you don’t need or connect to anyone by default. You just need initial connections to “open” the network in a sense. Not totally unlike how bitcoin core has a list of beginning nodes to start connecting.m, but they don’t matter in any meaningful sense and you could always change them arbitrarily without losing any functionality or reliability if you wanted.