Probably more like a zealous lawyer at Apple heard of it and based on a lawyery scenario/edge case (that would probably encompass all videos on youtube) decided

Probably more like a zealous lawyer at Apple heard of it and based on a lawyery scenario/edge case (that would probably encompass all videos on youtube) decided to send the notice for takedown to youtube. Youtube being run by zealous lawyers don't question any takedown by corps because at their scale, any % of false negative would be costly if they all issued lawsuits.