I don't suspect or accuse them of anything. Quite the reverse - what I'm saying is that without things like open source code, privacy audits etc, we're being asked to take their word for it all. They might well be the most privacy respecting company ever and they equally might not be. If you're happy to take their word for it, that's entirely your call. I'm not trying to change anyone's mind, I'm just answering OP's question with my own opinion.