"Messages are stored on our servers and are technically accessible at the database level , we won't pretend otherwise. Kloak doesn't require email, phone, or personal info to create an account, your identity isn't tied to your messages the way it would be on other platforms.

Our goal is to implement end-to-end encryption for DMs so that even we can't read message content. But we're not there yet, since after all we need to make sure the platform is safe and not to shield illegal content being sent."

This is a message from one of their founders I found while exploring the app.