Spotifys algorithm is amazing, I'm constantly finding new indie bands that I love on it. YouTube is also really good. Netflix is terrible for me, I don't think it's ever recommended a show I've loved.
Huh. My experience is the opposite. Somehow my Discover Weekly was mostly mariachi bands for a month. Finally told it I didn’t like enough of them that it got the hint. Now it’s overloaded with Scandinavian adult contemporary or something. It’s like all the other algorithms from one I’ve seen: listen to something accidentally that’s in a niche and it just loads up on recommendations from that niche.