Which product innovation did Daniel Ek introduce that saved Spotify from early failure by addressing music piracy concerns from major record labels?

The music industry has undergone radical transformation through digital innovation. Streaming platforms have revolutionized how we consume music, but the journey wasn't smooth. Behind every successful music platform stands strategic product decisions that changed an industry forever. Test your knowledge about one of the most significant product innovations in music technology history!

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The freemium model with ad-supported tier alongside premium subscriptions
Integration with Facebook's social graph for music sharing
Spotify Connect for seamless device switching
The Discovery Weekly personalized playlist algorithm