Sorts of Monopoly

Below the shaded nodes are the transmission providers and the top and bottom nodes need to communicate with each other.
Fig 1.Fig 2.
In figure 1 monopoly has the attributes that give monopolies a bad name. Collusion is bad for the communicators. In figure 2 it is better for the communicators if the transmission providers collude; they share a ‘commons’ with its potential tragedies. Perhaps everyone is better off if someone buys all the transmission providers in figure 2.