I think one could argue that one. Is a DDoS a symptom? In which case the intent is irrelevant. Or is a DDoS an attack/crime? In which case it is. We kind of use it to mean both. But I think it's generally the latter. Wikipedia describes it as a "cyberattack", so actually I think intent is relevant to our (society's) current definition.

The semantics that make sense to me is that "DDoS" describes the symptom/effect irrespective of intent, and "DDoS attack" describes the malicious crime. But the terms are frequently used interchangeably.