When people generate fake streams on Spotify (ex: put a 45-second track on repeat all week, volume on zero, for the purpose of fraudulently extracting money from Spotify...), said people are actually stealing from legitimate artists. That's because Spotify pays artists a pro-rata share of Spotify's revenue, based on how many times an artists' music was streamed.
Math: If there's $10 in the pot and my band has 5 (real) streams, and your band has 5 (fake) streams--I'm getting $5 instead of the $10 I deserve.
Spotify's fraud detection system is a very good thing for artists. The system exists solely to protect artist, and has no other obvious upside for Spotify.