Where are German users supposed to have received this message? I'm not German but my telegram account is registered with a German number and I haven't received anything
Via the chat labeled "Telegram" with the verification mark, the one you also get info about new features from when there's an update.
I don't know why, but the last info I got there was "Telegram surpassed 500 (https://t.me/durov/147) million active users. " from more than a year ago, and a few login codes