I have a somewhat biased opinion since I work in ML close to people building recommender systems at Netflix, but I think Tidal is a great showcase of the pros and cons of algorithmically curated content VS human curated. Tidal playlists are mostly human-curated and excellent. However it does not scale: it does not cover the long tail of wide ranges and nuances of musical preferences, nor does it cover such preferences over a large range of time. Their recommendation engine is orders of magnitude worse than Spotify's one. On the other hand, I also find that Spotify sometimes pushes algorithmic curation too far: one example of that is when they used to force an algorithmically-driven order of songs when playing an album instead of a linear order (until Adele complained loudly). I think there's a balance here: Spotify could benefit from some human-curated playlists that don't only cover mainstream genres, but Tidal should definitely invest into their recommendation engine which is really subpar, especially so because a much smaller user-base makes this problem harder to solve well.