@fluchtkapsel
As other replies point out, there’s already S/MIME and GPG.
The thing is:
- Any E2EE is a pain, wrecks UX, and most people don’t care enough to put up with it
- Overcoming the UX challenges is a massive tech + design + org lift
- Users don’t care enough and large players have strong incentives against
So, as usual, it’s not just smart people and the right tech; it’s social systems too.