But even with gmail, they give you the option to use your own apps because they support standard protocols that you can use to sync your emails. For E2EE email

But even with gmail, they give you the option to use your own apps because they support standard protocols that you can use to sync your emails. For E2EE email it's a bit different because most of the standard protocols don't work out of the box but it's very clear that whatever system Tuta uses works locally or they wouldn't have anything but a web app. I'm not saying don't prioritise your apps, I just want to be able to mutt and send in patches easily. And my grandparents want to use their outlook because it's what they know how to use.