What is the MDM Profile?
The Full Lock requires that you download an "MDM profile" for your phone. MDM stands for Mobile Device Management and it allows a secure third party to prompt an action on your device. In this case, the third party is Flipd and it is remotely hiding your apps for you and then pushing them back onto your phone based on a schedule. Only you decide when this feature is activated and Flipd will only hide your apps if you have explicitly enabled the Full Lock.
Why is this necessary?
Apple doesn't allow a third party app to hide or restrict access to your phone without certain verified permissions. Using the MDM is just the way we have to engineer the feature, and work with Apple's iOS software the way it is.
You're safe with Flipd