Earlier quoted context omitted.
Drawing over other apps is a problem too. On my OnePlus, I just checked, there are 23 apps with the permission to draw over other apps, but only 3 of those are the ones I've explicitly allowed. 20/23 apps are Google, OnePlus, or Android System apps. I never knew so many of them had this permission!
The 20 apps are all pre-installed from factory. If you don't trust those, then you need to change your device. There is no trivial way of removing them short of rooting or flashing a new ROM.
Use App Manager from f-droid and enable adb mode or wireless debugging and then freeze the unwanted apps. The manual tells you exactly how to use adb over USB or enable wireless debugging.