Copying is at least about 60% simplicity and convenience, and about 30% better quality and lack of commercial BS. Free is a nice bonus, but I have cheap tastes and more money than I need, so it's really not a driving force as long as the commercial stuff is reasonably priced. I really don't want to hunt through 4 websites/apps to find something. The fact that I know one will have something and no idea if one of the legal alternatives will is the crux of it - I don't have time for the results of their licensing games. It's the same reason I only shop Amazon with Prime.