You are paying Spotify to sell Spotify Premium.
You buy an ad on the free tier. That ad interrupts a listener who hates being interrupted. Their only thought is: “I need to upgrade so I never hear this again.” They upgrade. They go premium. And the moment they do — your ad disappears forever. You paid to convert Spotify’s free users into Spotify’s paying subscribers. You were never the advertiser. You were the product that made free-tier unpleasant enough to upsell.
PLTFRM ads reach paying subscribers — the highest-value audience in music. Your placement lives inside premium content, not as an interruption to escape. The audience stays. Your brand stays. No one upgrades away from you.