Copper price more than proximity. People don't strip wires for shits and giggles, they do it to sell the metal.
Bet you if copper price suddenly went up 10x, those ancient telegraph lines would disappear very quickly, one way or another (turns out, "criminals" and "junkies" and "entrepreneurs" are driven by similar incentives, they just sit at different points of the cost/risk tradeoff spectrum).
Bet you if copper price suddenly went up 10x, those ancient telegraph lines would disappear very quickly, one way or another (turns out, "criminals" and "junkies" and "entrepreneurs" are driven by similar incentives, they just sit at different points of the cost/risk tradeoff spectrum).