It can be called theft actually. It is the richest profession until the stealer is caught and contrary to the anonymity of the blockchain the person can actually be tracked down. In the most cases of hacking the person that hacks has probably the man inside the hacking point, in this case, the exchange which is simplifying the hack attempt for the hacker.
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Just look at the Slovenian exchange NiceHash. The major police investigation has taken the part after the hacking and they have already a suspect in the exchange. The hacking can be called the proffesion metaphorically but it is actually a serious theft which can lead to the serious consequences.