Wanna know how I know this? Because the original YouTube Rewind that was uploaded in 2010 is gone:

Fucking corpos.

7603009
They don't want to hear from filthy plebs.

7603094
True dat.

Though it has recently come to my attention that they have the first Rewind on a different channel:

Still, it remains to be seen how long that will stay up before their desire to appease their sponsors compels them to pull that one.