In the mid to late 2000s, the music industry was undergoing significant changes due to the rise of digital music platforms and file-sharing. "Graduation" was no exception to these changes. The anticipation and eventual release of the album were accompanied by leaks and illegal downloads, a common challenge faced by artists and record labels at the time.
From a technical quality standpoint, downloading a "repack" of music is risky.
Part of the allure of a "repack" is the hope of getting rare tracks, like Bittersweet Poetry (feat. John Mayer) or alternate mixes.