I'm working on the topic day to day in an adjacent field (movie & TV show discovery) and I'm currently not aware of any startup that has managed making money with the discovery experience itself.
It takes a lot of effort, data and persistence to get reasonable algorithms churning out something sensible and then, nobody wants to pay for it. If anything, it's usually an upsell to monetizing the content itself, which is why the only serious contenders to me here are basically Youtube and Spotify.
Even Netflix "had it all" with the million dollar recommender prize they set out in 2014, and I know their data science team is top notch. But if I scroll through their experience with my personal account in 2021, I basically still get "what all others are currently watching in {your_country} now" and I'm less than thrilled.
And that's exactly because once you've got the perfect algo together that would be able to recommend you that niche movie Netflix features you've never seen in the interface that you're _really_ interested in (I can recommend "Last Breath" in that regard), the VP Content comes in and tells everyone something like "hey folks, whatever you do, make sure you're only promoting our originals, because they cost us far less in licensing... oh and let's give an extra in-your-face boost to King's Gambler to give it that extra buzz that lands us in Variety"
Discovery is hard, and once you made a name there, it's rather easy to screw it up by monetizing it.