Except it was a user asking people to buy their tuts and he got them first. It wasn't some sort of targetted hiring of one person's tuts. And 4 months? How is that not abuse? That literally violates TOS section 1 under Prohibited Activities.
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Farming or PVP actions do not correlate to harassment or abuse. If said player was to harass you in such a way that is not an in game action, such as using slurs and or abusive language on a public channel(Campus/Walls/Pub), ATA may be able to take action.