Do they work? I'm thinking out loud, but I see two types of case: 1. People care enough about what's being kept secret, e.g. the Apple Watch. As a result, it l

Do they work? I'm thinking out loud, but I see two types of case: 1. People care enough about what's being kept secret, e.g. the Apple Watch. As a result, it leaks and the agreement didn't work. 2. People don't actually care about what's being kept secret because it's really boring, e.g. almost every corporate agreement. So yeah, nobody talks, but that's because nobody cares.