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This question already has an answer here:

Though there have been similar questions left stagnant over the years, this seems relevant with news of WhatsApp privacy policy changes.

Has Telegram made serious improvements to issues like dangerous defaults and rolling their own crypto to be worth seriously considering?

marked as duplicate by Trey Blalock, techraf, S.L. Barth, schroeder Aug 26 '16 at 6:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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This has already been answered and recently updated (as of yesterday).

Is Telegram E2E Still Insecure?