definition of exploit

Just saw the thread by viper saying numerous acc got banned.
I am wondering what is considered to be exploit and what is not. Does grinding ST boss for gold as hunter considered to be exploit? (hunters you know how that mechanism work)
Thanks so much for the clarification.
I am wondering what is considered to be exploit and what is not. Does grinding ST boss for gold as hunter considered to be exploit? (hunters you know how that mechanism work)
Thanks so much for the clarification.