Many in the crypto and privacy community mistakenly trust Telegram because it’s “end to end encrypted”, but there are huge issues including not hiding the metadata, censorship, centralization, and phone numbers.
Send this video to your friend that asks why you won’t join:
https://video.simplifiedprivacy.com/why-telegram-sucks/
I think you missed the most important part: all accounts are tied to a phone number
Except that’s not even true… https://www.livemint.com/technology/apps/telegram-brings-new-update-no-phone-number-needed-for-sign-up-more-features-11670403019183.html
And for most people, it doesn’t matter. It really doesn’t. I’m not even going to argue about that. I personally couldn’t care less about instant messaging with anonymity; anonymity and private are completely separate concerns.