Again though you're making assumptions that the data can't back up. If a site asks to send me notifications and I say no that doesn't make the notifications spam. That just means I don't want to see them for some reason.

And besides, for something to be spam you need to actually see it. In the case of notifications if you deny the permission on a site you don't see the notifications. That's the perfect spam filter. Imagine a world where people could only send you email if you explicitly said you accepted it from them. Or if robocallers could only call you if you agreed first. Spam would be over. There would be no spam. That sounds fantastic.