> Anyone can start a private chat encrypted end-to-end, those messages only stay on the device, and you can set them to auto-delete from BOTH user devices in 3 seconds, 5, 10, 30 second, 1min, 1 hour, 1 day.

Sure they can encrypt E2E but they don't. Most chats on Telegram are unencrypted. Huge channels like the one mentioned above are full of agents and nothing prevents them from taking screenshots.

Don't spread false security.