But pirating music is different from streaming it on some application. Like you don't own the music file you're just streaming it from some servers(in case of downloading you still need the app and can't share it to some other device).
Everybody had a bunch (or thousands) of MP3s because mobile phones weren't a thing, fast mobile connections weren't a thing and there was simply no infrastructure to have something like Spotify.
If we'd have Spotify with everything in 2003, we would not swap hard drives in school breaks.