1 Introduction
When was the last time that you bought a song as an MP3 file? This probably seems as obsolete as buying a CD, let alone a vinyl record. Mind you … the latter are currently experiencing a small renaissance. But let us not digress. The fact is that you are probably using one of the more common streaming services (e.g., Spotify, Apple Music, or Deezer) to listen to your favorite music. Presumably, you will not even notice that you are no longer paying to listen to (i.e., consume) a single song; that, to be sure, is a thing of the past. Paying monthly flat rates has probably become so burdensome that you consider regular charges such as your Netflix streaming subscription to be perfectly normal. The point is that exactly this subscription ...
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