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Telegram's "Privacy" is Bullshit (Video)
(monero.town)
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/
It may be once sliding sync and proper key handling of room history for new members get implemented.
Right now sync is very slow, the apps are heavy weight too (as I know at least partly because of how sync works today), and if a new member joins an encrypted room, they will not see the history even if you set it that way, because the clients that know the keys won't send to theirs.