While the original creator is anonymous, such collections were often compiled by fan editors or small digital labels. They were designed to be burned onto physical CD-Rs or stored on early iPods. The "25 CD" structure mimics boxed sets sold via TV infomercials in the 90s (e.g., Time-Life Love Songs ).
Large collections of this size (25 CDs) are often organized by sub-genre or era: Discs 1-5: Golden Oldies The Best Of Love Songs - Collection -25 CD-.rar