Even if you send only non-commercial notifications to users who requested them they still may uninstall your app (or for email, report as spam.) If you are in

Even if you send only non-commercial notifications to users who requested them they still may uninstall your app (or for email, report as spam.) If you are in a very competitive market for user acquisition - mobile game, Uber, crowd based delivery service, etc - 1 or 2 percentage points in behavior can be a really damn big deal. 1 or 2% uninstalling your app every week is enough to kill your viral coefficient. It would have been enough to kill Facebook. You are notch and you just made Minecraft? Probably doesn't matter.