the token used to send push notifications isn't immediately invalidated when an app is deleted. And since the server has no way of knowing whether the app is still installed after the last notification it sent
令人惊讶的是：用于发送推送通知的令牌在应用被删除后并不会立即失效。由于服务器无法知道应用是否仍在安装，它可能会继续推送通知，而iPhone则决定是否显示这些通知。这一机制为执法机构提供了在应用被删除后仍可能获取消息的技术可能性，而大多数普通用户对此毫不知情。