"Adding third party fiber to poles almost always requires the electric company to move up the height of their wires ..."
Do not believe this statement to be accurate! Poles and their use, have evolved with time. Surely, electric lines were at the top of poles before fiber lines were even thought of.
SEE,
"Very few utility poles are used for just one utility. Poles that house multiple services, like power, telephone, and cable, are called joint poles and are covered by strict safety rules that separate the utilities spatially."
https://hackaday.com/2016/02/22/a-fi...-utility-pole/
https://www.aep.com/assets/docs/safe...20Pole_AEP.pdf
"On poles carrying both electrical and communications wiring, the electric power distribution lines and associated equipment are mounted at the top of the pole above the communication cables, for safety."
https://en.wikipedia.org/wiki/Utility_pole
"3. Utility pole wires carry more than just electricity
You may have noticed that utility poles have many wires. But not all carry electricity. Usually, the top three wires — which are called primary conductors — carry most of the electricity on the pole."
https://www.electrocuted.com/2016/09...ty-pole-facts/