If I can deploy internal apps to Apple devices without getting them notarized, then open source devs can distribute their apps to their users without them being

If I can deploy internal apps to Apple devices without getting them notarized, then open source devs can distribute their apps to their users without them being notarized too, no? What is the measurable difference here? Obviously, open source apps still work today, but they won't soon. macOS will become a lot more like iOS soon.