In the sense that DMCA complaints are presumed valid, you are correct. In the sense that the company has plenty of time before they are required to respond to

In the sense that DMCA complaints are presumed valid, you are correct. In the sense that the company has plenty of time before they are required to respond to a complaint, it is the opposite, obviously no number of DMCA complaints would, by themselves, stop a popular song from being available on YouTube. Only contentID can do that, and YouTube deploys ContentID at their discretion while being protected by the DMCA from lawsuits. So when all is said and done DMCA is a real pain for regular people, while not providing the protection which was intended.