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)