I like I'm sure many predicted this would be inevitable regardless how better one product is over another. At the end of the day Spotify can't compete with Apple's budget, and music streaming isn't a long term profitable business on it's own. I love Apple and deep into their ecosystem. However, certainly not a fan of Apple Music. When using on the Mac iTunes is rather horrific since everytime I search it searches local music rather than Apple Music or vice versa, or its in the Podcast tab, etc. They need a dedicated Music app for Mac and universal search without the iTunes store. I'm sure they are moving towards this but until then rather miserable. The Spotify app isn't as clean looking but is much more practical and enjoyable to use. Finally, Apple is about curated playlists, where is Spotify is about algorithms which in my experience is the better route. So while Spotify maybe the better product, at the end of the day, Apple Music is more seamless for people in the Apple Ecosystem of Siri, HomePod, AppleTV and all and in the end will win out. Let's hope Spotify stay's long enough to make Apple Music better.
Forgot to add, that personally, I love YouTube Music. The algorithms and search and pool of countless remixes, live performances and old videos/music not on other places is unmatched. It lacks the Apple Ecosystem benefit, but is a hidden gem