Apparently what was happening was never learned. All phone lines have and have long been required to have best protection - installed for free.
Never forget what was taught in elementary school science. If that current does not have both an incoming and an outgoing path, then that electric current does not exist. If incoming on a phone line, then what was the outgoing path? None exists.
A surge is typically incoming on AC mains - the most exposed wires and the only utility not required to have effective protection. Incoming to all appliance on AC mains. Now hunting for earth ground. Best outgoing path is that phone line. It need not be outgoing on anything else. Best outgoing path is that phone line.
Incoming on AC mains. Outgoing (at the exact same time) destructively via that phone line and near zero joule protector. Damage is often on an outgoing path. But many, who forget what was taught in elementary school science, use wild speculation to assume that was the incoming path. And that no outgoing path existed.
Protection even from direct lightning strikes was, is, and will always be about connecting a surge to earth BEFORE it can enter a building. Informed consumers always connect a 'whole house' protector on a low impedance (ie less than 10 foot) path to single point earth ground.
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