I noticed this quite some time ago (2-3 months ago) when working on web push integration for my web app. All browsers work fine with subscribing for web-push notifications, Opera fails with some error. I feel like the service (or server) that is responsible for subscribing and sending the notification to users phone is just gone. Does not work on Opera Android either (would make sense if the web push responsible server is just gone). Did Opera cut this service off?