Whenever some app or service claims to respect your #privacy, check for two things:
1. Is it open-source on both client and server (if applicable) ?
2. Is the service itself decentralized in some way (federated, allows self-hosting etc.) ?
Now evaluate everything you use - iPhones, WhatsApp, Telegram, Signal, Gmail etc. using this checklist.
Try to find and use software/services which satisfy both of the above conditions.
1. Telegram server is not open-source yet.
2. Telegram is centralized and doesn't federate.
I don't buy their arguments against e2e encryption either.
#Matrix has e2e encryption but stores all messages on the server, allowing easy backups. You just have to keep your keys safe.
#Telegram's whole privacy model is, "there's one individual called Pavel Durov who will not sell your data and will be able to resist all coercion from governments to hand over the encryption keys"
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