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However, we recommend to keep the notification In coming releases, we might add a setting inside the app to turn it off for pre-Android-O devices.
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And still users can disable this notification from Android settings If we work as a foreground service, Android system will less likely kill our process
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Google is right, better to be transparent to all users So when we implemented these changes, we thought about it and apply for all versions, because: I assume, now there might be questions like "but my device is not Android O?". So by this way, an application provide some functionality (in our case real-time protection), while being transparent to user (with a notification). And when you have foreground service, your service is considered by Android system and it is not killed. If you have a foreground service, you can do things (without having UI), but a foreground service should be transparent to user, so you have to show the notification. So what's a foreground service and what does it do? So to be complaint with new SDK (API 26), we needed to work in a foreground service. Our real-time protection is a background process too. Especially when they are doing background operations. With Android O, Google wants to all applications to be more transparent to user. I can explain a little more about that notification icon
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