Maybe not so overzealous though. I'll let a few through because I know it CAN be abused but some don't abuse it so badly. A marketing notification here and there is fine, but a few of them send me multiple DAILY. Those get muted and then the next time an app causes me to go to my notification settings, I notice the previously muted one and I determine "Have I used this meaningfully lately?" if not, after muting the current notifications app, I go an uninstall the previous ones.
Not to me. Any use of push notifications for marketing purposes is an abuse of push notifications in my view.
I thought both android and ios has opt-in notifications? In other words if you're receiving a notification, you already explicitly opted into them at some point.