Gamerule for unique loot per player (friendly server)

Finding a chest only to find it's empty is one of the most frustrating experiences in Minecraft.

Of course, changing the core chest mechanics isn't feasible because it would ruin PvP. That's why I propose enabling or disabling this feature with a gamerule. This way, players in friendly matches can each collect their loot even if a structure has already been explored, while PvP servers simply leave this gamerule disabled.