Not only a few people, but the majority of WhatsApp users already believe that this application is encrypted and cannot be hacked easily
The trick is to get the message before it's encrypted or after it's decrypted. Even Facebook had plans to stick their nose in there, I don't know if they did it already or not.
There is one worse than that, gmail! Lose control over your email and good luck recovering all the accounts linked to it.
I shortly thought about adding GMail, but then I thought that we keep telling people to not keep their private keys and so on in e-mail.
But you're so right, I forgot about accounts on various services. Indeed, e-mail is necessary not only for recovering the account, but also for approving certain operations, including funds withdrawal.