https://en.wikipedia.org/wiki/Metcalfe%27s_law every time you add a node to network, size of network in nodes is growing linearly, but number of connections is quadratic almost exponential.
https://en.wikipedia.org/wiki/Metcalfe%27s_law every time you add a node to network, size of network in nodes is growing linearly, but number of connections is quadratic almost exponential.