Because if your rally includes someone playing Marvin Gaye's "Let’s Get it On," 2Pac's "Keep Ya Head Up," Beyonce's "Freedom," Kanye's "Power" or Kendrick Lamar's "Alright" it is prone to disappearing from the net.
These are accidental takedowns, dolphins in the tuna net – but you can use this tactic to go dolphin fishing, too: "These removals are all accidental, in the sense that they are false positives, there is the possibility of deliberately leveraging these flaws in the system."
Just in case somebody needed an additional reason of why we need a copyright reform. Maybe we could start with punishing automated and wrongful takedown requests. You know, for thins like these