The cassette (CD, DVD, etc.) tax

Since the people who want to collect the media tax on everything rely on polls to decide what people are using their disk space for, why don't they also rely on polls to decide who they should give the money to? Just let the people say whose music/books/movies/shows they have on their CDs, DVDs or USB drives and how much disk space it takes and distribute the money among the authors accordingly? Regardless of whether the author is a writer, a singer, Finnish, foreign or a member of any of the copyright organization. I don't think people have a lot of incentive to lie.