@Tutanota We don't actually switch services, because we're currently using Zoho Mail. At least our email aren't spied on by Google or Microsoft! We don't see any email ads (even on webmail), just newsletters we registered for.
@Tutanota I still (begrudginly) use Gmail+Google Calendar. If you have or make a tutorial on how to transfer Google Calendar over to Tuta Calendar, that'd be enough for some users to migrate also I think.