This is not a scientific statement confirmed by numerous network surveys, but I'm willing to bet it's true. Networks that work generally find enough money to survive for as long as they are needed to achieve their strategic goals. Either from their members if the members can afford to pay, or from public funds if they can't. Personally, I despise the neo-capitalist ideology of privatization that has eaten like a worm at the core of the concepts of human rights and the public good. My experience is that citizens' networks, as long as they have the right people and a strategic vision, find what they need to survive.
Structures are important.
They are especially important for reaching out and gathering new allies to strategic causes. But good structures are useless without good networkers, and generally, where good networkers are involved, appropriate structures will evolve. The same holds for technologies. The technologies that are used will depend on who is in the network. Good networkers communicate with whatever technologies work.