https://threema.com/en/resources/app-configuration
Threema Work App Settings | Configure Without MDM – Threema
Customize Threema Work app settings for your organization using the Management Cockpit. Easily configure features and disable functions without an MDM solution.
threema workwithout mdmapp
https://workspaceupdates.googleblog.com/2016/12/manage-ios-devices-without-mdm-profiles.html
Google Workspace Updates: Manage iOS devices without MDM profiles
google workspace updatesios