Keybase's remote helper (which does the crypto) is open-source, so if github did something similar you wouldn't need to trust them. That's the value of e2ee --

Keybase's remote helper (which does the crypto) is open-source, so if github did something similar you wouldn't need to trust them. That's the value of e2ee -- you don't need to trust the intermediaries, whether they start misbehaving, are forced to hand over data, get hacked, etc.