Unencrypted by default, dubious e2e encryption, proprietary backend, based in Russia and later Saudi Arabia (if I'm not mistaken), which aren't really known for their good stance on privacy.
It's featureful, so it's fine if you don't really care for the privacy of the conversations you're having in there, otherwise you have way better applications/protocols out there
Yea people here aren’t a big fan of Telegram sometimes but it’s still much more privacy oriented than most main-stream messengers, and it’s just a very well-made app
It’s fast, supports uncompressed file sending, can log in on multiple phones at once, has cute stickers, customizable appearance, etc