The amount of people here outraged that Spotify is preventing them from blocking ads on the free tier is astounding. Pay for the service if you don't want ads.
I think the outrage is more so that Spotify thinks it can tell you how your computer is operating. Other companies have found ways to circumvent adblockers, which is the route they should be taking here... Not telling users that their computers have to conform to some set of standards so that they can inject ads into your experience.
I don't understand the entitlement you seem to feel to demand that third option.