It does not matter how many nodes you add bc it's an isolated network and can't communicate with other haveno networks, just like local area networks (LAN), all haveno instances are isolated and there's is just one working haveno instance (haven-reto) and its controlled by a single unknown entity. Is this decentralized? Of course not. They can change fees and have full control over their network. Just need to push a new update, and since almost nobody installed from source, all nodes will have to use the new fees or they simply can't communicate. They nodes dont have a choice bc they dont have the same permissions like the network operator (haveno-reto) 

 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