[NayamAmarshe]

Because it is, if you read about it.

Their track record is excellent. Pavel moved away from Russia (and his team of 20 something members too!) only because the Russian government pressured them into giving access to their servers.

WhatsApp is anything but privacy preserving. You have 0 transparency. You can't even prove if the E2EE exists for 100% of the time or just 50% of the time because the binaries are obfuscated. On top of that, their privacy policy and being owned by Facebook says everything one needs to know.

Telegram, IMHO, is the only app that does not compromise on user experience and still provides fantastic privacy control and respects the user data. Sure, it's not E2EE, but no E2EE app can ever do what Telegram is doing at this scale.