Spotify too (allegedly) had bunch of pirated content to bootstrap the service. I guess the difference is that they (and YouTube) tried to pivot away from it, compared to Megaupload which seemed to have leaned into it instead.
Edit: found at least one source now when I went looking: https://torrentfreak.com/how-the-pirate-bay-helped-spotify-b...
> When Spotify first launched several people noticed that some tracks still had tags from pirate groups such as FairLight in the title. Those are not the files you expect the labels to offer, but files that were on The Pirate Bay.
> Also, Spotify mysteriously offered music from a band that decided to share their music on The Pirate Bay, instead of the usual outlets. There’s only one place that could have originated from.