[polygamous_bat]

> I think a better example would be You (AirBnB Host) rent a house to Person and Person loses the house key.

This is not a direct analogue, a closer analogy would be when the guest creates a copy of the key (why?) without my direct consent (signing a 2138 page "user agreement" doesn't count) and at some later point when I am no longer renting to them, loses the key.

[lesuorac]

I'm still much more interested in the answer to who is liable for the robbery.

Just the Robber? Or are any of the key-copiers (instead of losers w/e) also?

[Dylan16807]

I don't really care about the answer to that specific question, where there's only one household.

What I will say is the guy that has copies of 20000 people's keys should get in trouble if he loses his horde.