I think Nordstream is more of a special case. It was clandestine, but definitely not terrorism. It was an attack on enemy infrastructure in pursuit of an actual, real-life shooting war. One can argue that it was a bad (or good) idea, or that it was/wasn't effetive, or even that its externalities were beneficial in the long term, etc...
But it's not really in the same category as casually cutting internet lines to your peacetime competitors out of pique or whatever.
But it's not really in the same category as casually cutting internet lines to your peacetime competitors out of pique or whatever.