Why are you bullshitting people? Straight from your referenced link:
"The calculated use of violence or threat of violence to inculcate fear. Terrorism is intended to coerce or intimidate governments or societies in the pursuit of goals that are generally political, religious, or ideological."
Objectively intended to coerce or intimidate governments: do as you're told if you want to have a viable economy, because so much of today's economy relies on communication.
"to inculcate fear" is an essential part of that definition. Using bombers to drop bombs on a sleeping city is terrorism. Dropping bombs onto an undersea cable is not.
I mean, cutting cables is a violent act, property destruction is violence. Unless we're going to go with the weird reddit anarchist definition in which you can destroy whole structures and it isn't violence if nobody gets hurt because property isn't real, man