Diablo IV has announced that trading will be suspended in-game indefinitely after players discovered a way to duplicate items and gold.
Blizzard employee filthierich on the official forums made a statement regarding the moratorium on in-game trading, saying:
We’ve suspended player trading in Diablo IV until further notice due to a gold and item duplication exploit. We are working on a fix to amend this issue and will update you once we’ve reinstated the ability to trade. Once that is done, we will continue to monitor this activity to ensure a healthy playing experience for all. As always, any account that engages in gold and item duplication exploits will be actioned in accordance with our End User License Agreement.
We thank you for reporting this exploit to us and your patience.
At the time of writing, it’s unclear when trading will be reinstated.