A bigger problem would be that Spotify pays very little. And to have the bot "listen" to a song (to be eligible for payment) takes minutes of streaming, which turns to tons of time and a big bandwidth bill, since they'll need to do thousands of them in parallel...
This is where malware run bots come into picture ... it solves a lot of problem like not having to pay for bandwidth, evading detection by distributing access to the songs among varied IP and geography, etc.
