As a rational person on planet earth I can safely assume that if your country is not too broke to afford a spy service then it has probably attempted to spy/spied on the US at some point. That's what countries do when they don't know something that someone else is unwilling to tell them.
Do you really think that the US is unique in spying? or that the scale is even unique? Pro tip: if you do you're wrong.
Yes, the scale is unique for many reasons, one of the most important being that most of internet backbone including consumer services are located in the US jurisdiction. Your pro tip is worth nothing.
Why is anyone upset? I don't know, people don't want to be spied on? Hmm, yes, that may be the case here.