Here's something XD.
My First advertise vid I made had Miley Cyrus - See you again audio in it. That vid got popular within minutes with over 10 000 views. It's been going on for over 6 months until one day Youtube blocked it. Why, Copyright Issues.
Some of my vids I posted after copyright issues just to test them have been ignore, but later on the future they were targeted.
If you want to audio swapped a video that is instantly copyright on youtube, all you have to do is simply upload it private. The wait till it processes the audio swapped it.