Not exactly, no. These are weak analogies. The second one doesn't make any sense to me at all. Maybe I'm missing something. It's like sharing your private key,

Not exactly, no. These are weak analogies. The second one doesn't make any sense to me at all. Maybe I'm missing something. It's like sharing your private key, knowing that others also use that private key. You immediately make a large portion of your family tree discoverable. It's the same underlying reason that we (most of us lol) treat revenge porn as a bad thing. You take someone else's blanket of privacy away without their consent.