Did I say “all cities?”

Like many maps, this is just a map of cities

Everything is wire if the voltage is high enough

It’s a specific type of shorthand you see almost exclusively in news headlines. It means “and” - the sentence reads “Grubhub to pay…against customers and drivers”

Typically you will only see it at the end of a clause. For instance you might see “Gorilla beats chest, drum; musical talent lacking” or “Gorilla beats chest, drum. Musical talent lacking.” And they both more or less mean “Gorilla beats his chest and a drum, but he doesn’t have any talent.” (Though the first example is more correct). However you would not expect to see “Gorilla beats chest, drum, musical talent lacking.” That would mean that the gorilla beats chest their chest, a drum, and they also beat their musical talent which was lacking. It is obviously nonsense