Do leaked albums help or hinder sales? Maybe it's not a very relevant question anymore. But when "Kid A" was leaked before its release, it certainly sparked my interest, and it ended up being the first Radiohead album that I liked. But it's only now, 25 years later, that I've gotten a physical copy. And that, again, may not have happened if I hadn't listened to it a lot on #Spotify in latter years.
Anyway, I like the album now more than ever.