how the fuck do you run an email provider without storing anything on disk, first of all?

next point is mullvad is ready to close shop if that's what they need to do after a raid. but of you're storing people's data for their request basically, like Proton, you can't just do that because everyone will be mad for losing their data and access to the email service.

finally, Proton does provide a way to use their services in secret, as they run their onion site. login over Tor, done. but probably also create the account over Tor, and never log in through clearnet with that account