No, nobody did, what a weird concept.
Joking apart.
Do you want a trading system ?
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It wouldn't hurt to be able to trade some items, imo. They can always "bind" items that would be considered giving someone an unearned advantage to player's accounts (like mission reward exotics and court of oryx runes), so cheating wouldn't be likely occur too often. Someone will always find a way in those door ways, though.