Tired of the fact that everyone constantly offends Telegrams. Telegram is generally the best that now is. Can you give any arguments against?
I can 
1. It needs your phone number for registration - what is already not private.
2. It doesn't use end-to-end encryption. They tell they use it for secret chats only which are not available to everyone - only to iOS users.
3. IP address is exposed to operator
4. It has an access to user location
5. It stores all data on the server
Should I continue?
so, do all your really necessary correspondence in secret chats, what's the problem? I do not think that you are such an interesting person, that some people are watching you and your correspondence 
I think it's not about correspondence only as some people do crypto transactions using messengers for example and they don't want to leak information dedicated to it for sure.
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with the help of the Telegram, it is now possible to carry out various kinds of transactions absolutely calmly and without fear. he is really safe. In this messenger, no one will definitely steal your data.
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So I just proved you that it's not safe at all and you start speaking about safe transactions in Telegram? Are you insane?
You'll remember my words when you'll lose your money using that shitty messenger.