Earlier quoted context omitted.
I'd audaciously guess that it's the songs you play in it that makes the spotify app popular, not the pack of ones and zeroes that the developers thereof like better.
Ever hear of the Napster audio app? Not the p2p thing, the paid subscription app? It was just like Spotify, way before Spotify? Oh really, no, you hadn't? Could it be because the UI was terrible? Hm. What about rdio? Back in the day, I remember noticing they had a much better music archive than Spotify in some areas like prog. Still, I never made the switch. (The way they organized music was terrible.) Apparently, ne…
(edit: I'm an amateur musician, I do know quite a bit about the online music sphere, and I've been a paid user of both Deezer and Spotify in the past. You usually don't know who you're talking to on the internet, so better don't assume things.)