I have never used Opera. Still, once a day or so I get a notification of some news headline. I don't have to open opera for this, it appears on my phone "dashboard" that lists all my apps and I can also see the notification from the screen that just shows the clock and text message notifications, etc. (Sorry I don't really know much mobile terminology).
Is this the same issue described here? How to turn off Opera Mini "discover"/"top stories" news feed? The person who posted that question seems to have a problem with the browser home page showing news stories.
I'm using Android 6.0.1, Security Patch Level Oct 1, 2016. My phone is a Blu Life One X2.
This feature is extremely irritating and I wonder who thought such an intrusive app was a good design decision.