They upload the sound clips, YouTube finds the matching videos and sends them a list, then a human reviews the list(haha just kidding) and activates the revenue stealing. I'm sure some of those videos are earning a lot more than $1/year.
A machine (script) can send out a lot more than a hundred/hr.
Remember, they don't have to be true.
The person clicking the button just needs to think it's true.
And somehow the user is the one that might get banned in this scenario?