Copyright is actually very important, especially to independent authors, photographers, digital artists, traditional artists, videographers (YouTubers as an example), and especially movie producers. Copyright protects their work from being taken by someone else and claimed as their own, however special cases do exist where other individuals are allowed to use copywritten material that is not theirs, this is where fair use comes into play. If we did not have fair use, but still had Copyright, the large majority of YouTube videos would be illegal, from commentary videos to silly meme videos. So calling Copyright a cancer is like wanting their work to be out in a field of monkeys and hope they don’t notice it, spoiler, they always do.