Well this is too debatable if you ask me. One can interpret it both ways, on one hand one could say it's abuse from moment one you jab yourself with whatever dose of AAS since you practically bypass your normal hormone production / natural balance of your body (TRT is exception) but on the other hand you can say using AAS is not much more of an abuse then say eating daily at McDonald's since you put the 'wrong' substance in your body but in different compositions.
Abuse can also be the fact that we go to the gym, and we abuse our body day after day after day, causing muscle damage, then aiming for quick recovery and doing it over and over again just to build mass / loose BF. If you didn't notice, no other creature has this behavior, lifting big weights for no real reason but just for arguably enhancing esthetics. Abuse, addiction, what is normal and what is not, what defines normality...all those subjects are too prone to interpretation and subjectivism that i'm afraid no one will ever find the absolute truth or to really answer the question(s).