There is around 60 devs who worked on Haveno, the project is open source, if someone do shit, fork is easy. Like in Bitcoin or torrent trackers, there is a seed node for discover peers, the network is decentralized with dozens of nodes actually. There is no network operator because it's decentralized. Eventually, supposing there is only 1 seed node and it crash, the peers will be unreachable so it will be impossible to load data and doing transactions. There is no fees except for arbitration