This fits the bill for terrorism in my mind, it is an intentional act to directly affect the people of a nation, and if it causes even one death it becomes way more likely the law will see it as such. Who knows when (one of these events will eventually cause a response from fed) cyberattack becomes synonymous with terror attack, though. Could be this one, could be the future (hypothetical) attack on Fox News or CNN, could be someone turning off the sewage treatment plant for DC, one of them will ruffle the right feather, eventually.