I'm sure that they would love to see that in action, but I'm pretty sure efficiently scanning the 100 years of video that is uploaded every single day isn't quite as easy as you think. Also if the group of engineers at YouTube are having a hard time getting it 100% correct you can believe it is a hard problem to solve.

I'm sure the large majority of people are playing by the rules, just these small exceptions always keep getting posted to HN like they are the end of the world, but in reality they are the extremely small exception.