It only works on Apple devices. I use an iPhone but also a Windows PC. It’s extremely simple to not consider Apple Music if you don’t have all Apple devices. I hate that ultimatum of “use ONLY our products or have a subpar experience.”
EDIT: I'm pretty sure iTunes for Windows has Apple Music support actually: https://support.apple.com/en-us/HT210384
Anyway, another factor in the decision could be that aside from Tidal, Apple Music pays the most to the actual artists per stream. Almost twice what Spotify pays, I believe.