I also wrote about the factually bypassed Encryption in #Telegram on http://wp.blausand.net/telegram-vs-signal/
Although Telegram is still installed for those few contacts, I strongly recommend switching to #Signal and pushing relatives to abandon Wha'pp and Telegram.
Remaining question is of course: How do we protect the single safe solution from bad legislatory forces while it's neither decentralized nor open-sourced?