A proportion of these free users turn to ad blockers, and this is something Spotify has been increasingly trying to clamp down on. Now that the systems exist easily detect who is using an ad blocker it is now very easy to ban users who use them.
Until now, listeners who broke the rules had their accounts suspended, and were sent a warning via email.
"Circumventing or blocking advertisements in the Spotify Service" will result in immediate termination or suspension of your account, Spotify explains.
It's not clear under what circumstances the company will outright give the boot users for blocking ads, or whether it plans to issue warnings ahead of taking such an extreme measure.
Spotify already has detection measures in place to identify users who are circumventing ads, and previous year it estimated that two million people were using its free service in a way that generated no revenue for the company or musicians. It seems as though this softer approach hasn't been enough of a deterrent for the platform, which will instead begin enforcing stricter punishments as of March 1.
Spotify did not immediately return CNET's request for comment.
During its fourth-quarter earnings call Wednesday, the company reported its paid subscriber base had grown to 96 million from 71 during the same quarter the previous year.
While the music streaming service has a decent number of paying users, a large percentage of the userbase stick with free, ad-supported accounts.
Spotify's web player is one of its best features, but it also opens the door to a significant problem: Ad blockers.