[throwaway101416]

There is a difference, because these people in the middle don't have your contacts and don't have root on your phone.

[api]

This is a common problem with nearly all software, especially on phones.

[throwaway101416]

A common problem that is mostly solved by other services (like the black phone).

[api]

At some point you have to trust someone unless you refine you own silicon, make your own chips, audit every line of code they run, etc.