Everyone in the comments is acting like you're comitting a war crime, but the majority sees no problem with adblockers, which are pretty similiar, especially autoclicking ones.

The only one directly losing resources is the ad company, until they get tired of it and stop advertising on Spotify. But Spotify is affordable, so the amount of people that jump through hoops and use these methods is insignificant.

My guess is that you still benefit them more than people who share accounts.