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That depends. A business that uses notifications for marketing isn't one I want to do business with. If there's a decent competitor I'll switch. If there isn't then I'll decide to begrudgingly put up with it (and probably complain a bit on social media) or to do without it.

So far I've never put up with it and always either switched to a competitor or abandoned the whole thing.

As long as this option is presented before attempting to display any push ads, and not after.

If I could set the default for all apps to "block ad notifications", then yes.