A variant of your point three: * Avoid inventing new categories of notifications. When you have to, don’t default the new category to opt-in for users who have

A variant of your point three: * Avoid inventing new categories of notifications. When you have to, don’t default the new category to opt-in for users who have opted out of the closest existing one. Two rounds of notification whack-a-mole and your app is getting uninstalled.