"Source: Company statement"

Here you will never see any XMPP-User. Please, stop promoting all the proprietary stuff and start using clean XMPP.

There are a lot of free available servers. If you don't trust them, just install your own. My account is running on my own Raspberry Pi which is located in the most trustful space: my home

There are good apps for any platform: Linux, Windows, Android, Meego, Sailfish. Most of them can also use OTR for end-2-end encryption.

All the XMPP-servers communicate with each other via TLS and forward secrecy. Which of the commercial systems can provide such functionality?

Sailfish is using Telepathy-Gabble which support OTR, Streams-Transfer and a lot more of XMPP-features.

Just torture them with questions until they provide all of the features in the GUI!

XMPP is very flexible. Its very easy to use it as bot for e.g. automations. You have stable libraries for C++/Java/Perl/Python/...

So tell me, why using something like Whatsapp???