Unfortunately, nothing that we can do about Apple’s way of re-ordering the apps when they come back. This is a limitation of how Apple's Device Management works at this time (as of March 2018)
We are hopeful that Apple will further the protocols that developers like us can use so that we can offer more in the future. Recently, Apple acknowledged that they need to do more and have made some plans in their iOS 12 to have a Digital Health component to fight addiction.
One of our cofounders has reached out to Apple directly, read his emails here: https://goo.gl/bisUj7 In the meantime, we continue to work at offering our best under the limitations of iOS.
One of our upcoming ideas is around blocking the internet access for a specific set of Apps such as social media apps and popular games. This will not hide the app but render it useless since it will not be able to connect to the internet. What are your thoughts on this approach?