I came across with this app DetoxDroid and looks good enough to control phone usage.
but it says, The "WRITE_SECURE_SETTINGS" permission is mandatory for the "Automatic Grayscale" feature. The "set-device-owner" permission is necessary, if you want DetoxDroid to be able to automatically deactivate apps. Both permissions can only be granted from your computer via adb.
Is these permissions are okay to give for this app, or should avoid using it at all? looking for opinions.