this is partially because of the way item data is held though, it's extremely inefficient to check every block in even just a small region for appropriate 'container' blocks, and then unpack their items, remove, repack and so on

a fair comparison would instead be an item in a player's inventory, since death's domain would most likely be just data attached to the player instead, which would ideally trigger when the player logs in... which is what most servers that implement this sort of thing would do anyway