Product idea: A jukebox app for bars, pubs and cafes. The bar runs local wifi, a server and a sound system with a subscription to one of the music services. Punters on the same wifi run the app and nominate tracks for the queue. Other punters can veto or down vote choices in the queue. For entries in the queue up/down votes promote or delay them. If the current song gets too many down-votes it's cancelled and skipped.
Paid for by advertising and the generated big data, obvs.