Pgp and such could solve a lot of this, if only Gmail were to implement it. But if they did, they would in a proprietary and non interoperable way, because ever

Pgp and such could solve a lot of this, if only Gmail were to implement it. But if they did, they would in a proprietary and non interoperable way, because everyone is building their own little castle rather than the highways between nowadays, and if you want to communicate "securely" with your neighbour, you'll have to install a 7th chat app on your phone