Fallout 76, in Q1 2019, will be receiving a new game mode that will contain no PvP restrictions.
Announced by Bethesda, this new mode will allow players to engage in PvP combat without both players agreeing to a duel.
In the main game, if one player were to shoot/engage with another player, the damage dealt would be greatly reduced until the other player returns fire.
While this helps prevent griefing and may promote cooperative play, it took out a lot of danger that some players were looking for in the hills of Appalachia.
Source: IGN Video Games All