Telegram group chats are NOT end to end encrypted. Telegram has an option for e2ee chats but they won’t sync across devices, last I checked, ans nobody uses them.

Keybase has an amazing, user friendly e2ee story.

My use-case is E2E encrypted (team) chat coupled with identity verification. In some projects having assurances that you're talking to who you think you're talking to can be a big deal.

Delivering software is a great usecase for public files. I have my apps on Github or whatever but the artifacts go into my public Keybase directory.

It's good if you want to share secrets (files or msgs)