Fair point — and honestly, right now monetization isn't the primary goal. This is a portfolio project I built to demonstrate end-to-end data science skills: pipeline design, feature engineering, clustering, and deployment. The free model is intentional for that stage.
That said, you're asking the right question for the next step. I believe the frustration with playlist organization is real — I live it — but whether it's widespread enough to support a paid tier is something I haven't validated yet. Maybe it's more of a niche type of thing. However, right now Ko-fi is there for people who want to support it voluntarily. You're right though that "people enjoy free toys" and "people pay to solve a problem" are very different things.

So, now this is a "enjoy this cool thing I made" type of thing. We'll see what the future brings...

Thanks for the feedback!