With several million users using illegal systems to get around ads, the music streaming service is forced to take action
The biggest difference between the paid version of Spotify and the free version lies in advertising. Totally absent in the first version, free Spotify instead "repays" the listening by users thanks to advertisements that pop up every two or three music tracks played.
Using some extensions or specially modified versions of the Spotify client, some millions of users (two, according to the latest data released by the same Swedish company) manage to block ads, thus managing to listen to music on Spotify without interruptions. These are real ad-blocks for Spotify that, in fact, turn the free version of the music streaming service into something very similar to the paid version (if not exactly identical).
How Spotify wants to block those who use ad-blocks