Came here to say this. These are just companies each with a product to sell, and their cash grab is being cloaked in an air of false righteousness.https://www.change.org/o/digital_wellness_developers
I have never heard of any of these. This all seems like a way for these companies to sell you their products rather than a true concern.
Also - being able to change the iOS UI that dramatically would be a terrible security flaw. Somebody gets you to install an app that throws up its own mimic of the Apple ID login UI on top of everything else. If Apple did feel compelled to do this (and that's a titanic IF), it'd be something that was only available on supervised/MDM devices, which immediately eliminates all personal devices.