Also, processors in the future must not have been able to keep up with the shear scale of the galactic digital library system because Shazam took days to figure out what Joran's song was. Or perhaps the Federation's internet was on strike due to new piracy legislation the council was considering. Who knows?
Earth lost the technology during WWIII and the Ferengi currently are the only ones making the app. Of course, with the money-less economy of the Federation, they can't afford to buy it.