We (mostly) agree that All Cops Are Bastards because the ones that don't do shit like this often don't speak up, or outright defend those that do.
So, can we start saying "All Hockey Players are Bastards"? AHPAB isn't as clean to say, but the hockey player culture is just as full of rapists and violence.
They can only tell that something is blocked because the ad wasn't loaded from a server. If it's not loaded, then they can't count it as "viewed."
If the ad is just blacked over, it is still loaded, and they wouldn't know.