I'm kinda surprised to hear people having this problem on Android. I've found Android's notification management to be superb and, as others have said, with a one strike rule, this has been a non-issue for me.

> I live in a gated society that uses an app called MyGate to allow visitors, and the app intentionally pushes ads through the same channels since you cannot block them.

This strikes me as against the Play Store policy, potentially Notifications VX-S1, "Notifications are not used for cross-promotion or advertising another product, as this is strictly prohibited by the Play Store."

Worth a try to report them.