I ditched a samsung galaxy note because of that, it would do stupid things like send me a notification for each local NFL game, which I couldn't disable. Amazon's kindle app and amazon prime video app did similar.
It's pretty easy, I'd expect anyone that values their attention to remove the app or silence the notifications.
I don't get why people allow marketing notifications. If an app gives me a marketing notification without a way to disable it, that app gets uninstalled immediately. (Apps shouldn't even put up marketing notifications without you opting in first, but sadly this is the world we live in.)
But sometimes the notifications are useful… taxi/Uber has arrived, SMS/Messages, calendar reminders, important Slack channels, etc.