What if you are not playing with any friends and your team-mate is a random, are they allowed to open chests since randoms are harder to control?
Really good question actually, it hadn't really occurred to me. Initially, my idea is that duos submissions should be only between two players trying to achieve a victory with no chests, because if one runner was barred from looting chests then it would be similarly possible for the other teammate to hand them loot (or similar advantage).
At the moment I think it's best if duos both loot no chests for the category (i.e, playing with a random teammate will not be tenable unless they disconnect immediately), so I've added an extra rule mentioning that, but if anyone else has a comment on this please say so!
