https://www.polygon.com/2019/1/14/18181398/fallout-76-item-duping

In Fallout 76, players emerge into Appalachia after a nuclear war and must establish a new society by fighting the Scorched and the nefarious Scorchbeasts that spawn them. It’s not a bad hook, but players have discovered a more pressing threat to the safety of this new world: item dupers.

Duping has been in Fallout 76 for some time now. Duping is when players take an existing item and, using in-game systems in a way not originally intended, duplicate it, creating an infinite stream of powerful items. It’s a serious problem, and it has created a completely out of control economy. Players are creating new alternate characters to serve as pack mules, roaming Appalachia with thousands of pounds of legendary weapons and stashes full of caps, Fallout’s currency.