This is called the corporate carpet bomb. And yes, it is often very effective because the upper management doesn’t like being bugged by small things like this. So they’ll often acquiesce just to get you to go away. And it usually only takes one upper manager to bother. Even if nine of them ignore you, the tenth will tell their underlings “hey, what’s the problem here? Why am I being CC’ed? Just fix whatever it is so I can stop getting emails about it.”