Because everyone cyber attacks everyone and only the disruptive and huge ones get attention. The US a few years ago hacked into the powegrid of Russia.
Luckily countries are run by humans and not AI and it has become an unspoken rule that stuff like spy work, hacking and even assassinations are not to lead to full scale war, atleast not between major powers.
And frankly, we are smart enough to know that a war is overkill for a bloody DDoS attack.
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