I don't have issues with Telegram as such (it has some great features in and among its annoyances), but ditching WhatsApp for Telegram if you are concerned with privacy is a bit disingenuous. Telegram chats aren't end-to-end encrypted by default, and group chats aren't encrypted at all (if I understand correctly).
Telegram is also at its root an advertising company, and though its business model differs from that of Facebook / WhatsApp in a number of fairly important technical points, but in the end, they use data in similar ways to what Facebook does. Others such as Signal, Threema, Wire or Wickr don't have this problem, they have entirely different models.
So to me it seems like deciding you don't like German cars, ditching your VW, and buying an Opel instead.