I work for a utility company as a field engineer and have been dealing with poles for 10 years. I can tell you most utility companies don't care. I would even venture to say put an eye bolt if you want. One bolt won't hurt the the pole.
I would not recommend keeping something permanently hung from the pole for two reason. First like OG said, lightning rod. Second, if work is ever done on the pole it is much easier to cut whatever you have attached than it is to untie. Make no mistake about it, utility workers will cut off a strap to a hammock if they have to work on the pole.
Word of advice, like most have said about the creosote. If the pole is a dark pole it will have creosote and I recommend a dedicated tree strap. You don't want to keep that stuff with your hammock. Creosote will react with the skin and cause an itchy rash. If the pole is greenish it is treated differently and contains no creosote. Green poles are cleaner on straps but are extremely hard and you may have trouble getting an eye bolt into it.
Hope this helps and happy hanging.
PS. If the pole looks really old I would recommend not hanging from it. What does an old pole look like you ask? look for deep grooved in the wood, lots of climb marks, or look at the top of the pole. If you can see gaps in the wood at the top of the pole it normally means the pole is rotting from the inside out. Use caution.
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