YouTube famously spent many of their first years turning a blind eye to blatant copyright infringement.
Shady “growth hacking” is more the norm than not for many of these early stage social companies that have chicken/egg Metcalfe’s Law issues for user adoption.
YouTube had to have an informal deal worked something out with the studios. Circa 2004, the internet was awash in streaming video sites with copyrighted Family Guy and Futurama clips, which were often taken down. Then boom, one day those sites themselves go offline, and that content all moves to Youtube, where it stays up.